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	Chapter Connection: Is It Alive? Children visit Web sites that show pictures of students' rooms. Children classify selected objects from the pictures as living or nonliving. More info Chapter Connection: Old MacDonald Children visit Web sites to learn how people around the world spell and identify the sounds made by different animals. More info Chapter Connection: Flowers Everywhere Children visit Web sites to learn that there are many different kinds of flowers and that flowers can be found growing in many places. More info Writing for Science: A World of Living Things Children write about the things their favorite plants and animals need to live. More info National Lab: You're It!: Outdoor Exercise Lab Children conduct a survey concerning outdoor activities in their community. More info
	Chapter Connection: Mystery Tree! Children visit Web sites to learn how to recognize leaf shapes and vein patterns. Then they look at leaves to identify trees. More info Chapter Connection: Who Goes There? Children visit Web sites to learn how animal tracks can help them identify animals. More info Chapter Connection: Zoo News Children visit Web sites to learn about the life spans of animals that live in zoos. More info Writing For Science: Writing About Habitats Children write about habitats and describe different animals, plants, and nonliving things they might find in each habitat. More info National Lab: You're It!: Outdoor Exercise Lab Children conduct a survey concerning outdoor activities in their community. More info
	Chapter Connection: Where's It From? Children learn that people have grown plants and spread them to new areas for many years. Children visit Web sites to learn where some common plants were first grown. More info Chapter Connection: Animal Copycats Children learn that some animals protect themselves by looking or sounding like other animals that are poisonous or that taste bad to predators. More info Chapter Connection: Egg Hunt Children visit Web sites to learn how fossilized dinosaur eggs give scientists clues about the lives of dinosaurs. More info Writing for Science: Plant, Animal, or Dinosaur? Children write a description of their favorite plant or animal. More info National Lab: Dinner Bell: Food Chain Lab Children decide if the foods they eat are producers or consumers. Then they classify foods from their diets into food groups of the Food Guide Pyramid. More info
	Chapter Connection: Ring Around the Tree Students learn how scientists read tree rings. Students visit Web sites that explain how scientists get information by studying tree rings. More info Chapter Connection: Traveling Seeds Students learn that seeds are carried to new locations by wind, water, and animals. Students visit Web sites that explain how different types of seeds are spread. More info Chapter Connection: Arachnids Students learn about the characteristics of arachnids. Students visit Web sites to learn about spiders and scorpions. Then they complete a Venn diagram to compare and contrast the traits of these two kinds of arachnids. More info Chapter Connection: Father Knows Best Students visit Web sites to learn about the life cycle of the sea horse. More info Chapter Connection: Home, Sweet Home Students visit Web sites to learn about termite mounds. Then they complete a crossword puzzle with facts about termites and their homes. More info Chapter Connection: Alien Invasion Students learn about non-native species that invade new habitats. Students visit Web sites to learn about the introduction of kudzu from Asia and how it has affected ecosystems in the United States. More info Chapter Connection: Vanishing Frogs Students learn that scientists study frogs as indicators of the health of an ecosystem. Students visit Web sites to learn how frogs are affected by changes in environmental conditions. More info Chapter Connection: Wild Critters Students visit Web sites to learn why it is important not to feed wild animals. They create a poster to discourage people from feeding wild animals. More info Writing for Science: Pick a Plant Students report how the plant of their choice uses roots, stems and leaves to survive. More info Writing for Science: But I've Just Got to Have It! Students write a letter asking for a pet and describe the care the pet will need to survive. More info Writing for Science: Running with the Pack Students write a fable to explain how a group of animals got its collective name. More info Writing for Science: All About Food Students tell the origin of the components of one food. Then they describe how the food looks, smells, tastes and feels. More info National Lab: Dinner Bell: Food Chain Lab Children decide if the foods they eat are producers or consumers. Then they classify foods from their diets into food groups of the Food Guide Pyramid. More info
	Chapter Connection: First Flower Students visit Web sites to learn about the discovery of the earliest known flowering plant and compare it to modern flowering plants. More info Chapter Connection: Flower Power Students visit Web sites to learn that the design of a flower makes it easy for an insect or other organism to pollinate it. More info Chapter Connection: Down by the Sea Students visit Web sites to learn about marine iguanas in the Galapagos islands. More info Chapter Connection: An Incredible Journey Students visit Web sites to discover that human caregivers have taught cranes in captivity how to migrate. More info Chapter Connection: Light Matters Students visit Web sites to learn how a plant moves toward light through the process called phototropism. More info Chapter Connection: Free Meals Students learn that a parasite gets energy to live by harming a host organism. Students answer questions and complete a diagram about nematodes, which are common parasites. More info Chapter Connection: Ant Gardeners Students visit Web sites to learn about leaf-cutting ants. These ants work together to cultivate a fungus that they use for food in their ant colony. More info Chapter Connection: Paintings from the Past Students visit Web sites to learn about cave drawings made by prehistoric peoples that show extinct animals. Scientists study the drawings to determine how the animals of long ago looked and behaved. More info Writing for Science: Dinosaur Footprints and Ferns Students write short stories in which they describe giant ferns that existed during the times of dinosaurs. More info Writing for Science: The Poetry of Invertebrates Students write a poem to describe the movements and habits of a sea animal. More info Writing for Science: Disaster! Students write a script for a reporter who is covering a natural disaster. More info Writing for Science: Where'd They Go? Students write an editorial for the newspaper in which they advocate one theory about the extinction of dinosaurs. More info National Lab: Feathered Friends: Birds Lab Students build a bird feeder and observe birds. More info
	Chapter Connection: Amazing Sponges Students learn about sponges and their unique characteristics. Students visit Web sites to learn how sponges carry out life processes and to learn about the different types of cells in a sponge. More info Chapter Connection: Name That Tree Students learn that scientists use keys to identify trees. Students are given the characteristics of two trees and use online keys to identify the trees. More info Chapter Connection: It Takes Two Students learn about an organized picture of an individual's chromosomes called a karyotype. Students visit Web sites to practice matching chromosomes. More info Chapter Connection: Carbon Copies Students learn about cloning and the sheep named Dolly. Students visit Web sites to learn how scientists clone sheep and to learn about some possible benefits of cloning. More info Chapter Connection: Polar Bears Students learn about polar bears and their adaptations to arctic conditions. Students visit a Web site to learn about special characteristics of polar bear fur and how it helps keep polar bears warm. More info Chapter Connection: Sea Cows Students learn about manatees and where they live. Students visit Web sites to learn about special adaptations manatees have for living in water. More info Chapter Connection: Freezing Fish Students visit Web sites to learn how antifreeze proteins in the blood of certain arctic and antarctic fishes keep their blood from freezing. More info Chapter Connection: Desert Extremes Students learn about hot and cold deserts and where they are located. Students visit Web sites, choose a desert, and learn about the plants and animals that live there. More info Chapter Connection: Does Your Garden Grow? Students visit Web sites to learn about the history and advantages of hydroponic gardening. More info Writing for Science: Close Encounter Students describe a close encounter with an invertebrate. More info Writing for Science: All in the Family Students describe particular traits that have been passed down through a family they know well. More info Writing for Science: You "Otter" Try It! Students write a first-person essay about the life of a sea otter. More info Writing for Science: Come On Out Students write a travel brochure about a trip to a rainforest. More info National Lab: Feathered Friends: Birds Lab Students build a bird feeder and observe birds. More info
	Chapter Connection: How Small Is It? Students visit Web sites to learn about the relative size of biological structures and to view photos of very small structures. More info Chapter Connection: Wrap It Up Students visit Web sites to learn about the structure and function of the cell membrane. More info Chapter Connection: Division to Multiply Students visit Web sites to learn about mitosis and to see animations of this process of cell division. More info Chapter Connection: The Evidence Students visit Web sites to learn about DNA fingerprinting and examine some DNA fingerprint evidence. More info Chapter Connection: Ships of the Desert Students visit Web sites to learn about the adaptations that camels have for living in the desert. More info Chapter Connection: I Will Survive Students visit Web sites to learn about animals' adaptations to different climates. More info Chapter Connection: Where Does All the Carbon Go? Students visit Web sites to learn about the carbon cycle and the importance of carbon in the environment. More info Chapter Connection: This Land Is Wet Students visit Web sites to learn about the characteristics and the value of wetlands in the United States. More info Writing for Science: Getting Up Close and Personal Students write a skit in which various kinds of cells are interviewed by a talk show host. More info Writing for Science: Gene Pool Students write a newspaper editorial in which they discuss the benefits and risks associated with genetic engineering and research on the human genome. More info Writing for Science: Darwin Diaries Students write an entry in the diary of a naturalist who is exploring the local neighborhood for the first time. More info Writing for Science: The Frog and the Shopping Mall? Students write a fable in order to deliver a message about human impact on the delicate balance of an ecosystem. More info National Lab: Feathered Friends: Birds Lab Students build a bird feeder and observe birds. More info