California Science: Student Edition: Grade 4 by Dr. Jay K. Hackett

By Dr. Jay K. Hackett

Existence technological know-how; dwelling issues desire strength, dwelling issues and their Environment.EARTH technology; Rocks adn Minerals, gradual alterations on the earth, quickly adjustments on Earth.PHYSICAL technology; electrical energy, Magnetism.

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Test Your Prediction Observe Use the hand lens to observe both leaves carefully. What do you notice? Communicate Record your observations in a chart like the one shown. How are the leaves different? Leaf Trait Leaf A ● leaves from two plants ● hand lens Step Leaf B Texture Color Size Shape Draw Conclusions Infer Tell what each leaf trait on the chart is for. For example, you might infer that fuzzy leaves are for catching rain. Colored leaves might be for attracting insects. Record your ideas. Explore More What leaf traits do both leaves have in common?

They need oxygen to carry out life processes. Most of the oxygen we breathe comes from plants and plant like living things that make their own food. Plantlike living things in the ocean, such as this kelp, produce much of the oxygen you breathe. B Quick Check Compare and Contrast How does the way plants get energy differ from the way animals get energy? Critical Thinking Would animals be able to live without plants? Why or why not? 31 EXPLAIN A Compare the number of plants to the number of animals you see in this picture.

Are bears carnivores because they eat animals? Are they herbivores because they eat plants? In fact, bears are called omnivores. An omnivore is an animal that eats both plants and animals. Other examples of omnivores include raccoons, pigs, dogs, and chickens. Some insects, such as wasps and flies, will eat both plants and animals. Most people are omnivores, too. People eat from a wide mix of plant and animal food groups. Both omnivores and carnivores are called secondary consumers. Find a Food Chain Take a walk with a partner around the schoolyard.

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