By Naomi Pasachoff
Examines the character in addition to the idea methods which led this inventor to his discoveries that have helped our figuring out of the wildlife.
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Extra resources for Alexander Graham Bell. Making Connections
Conduct research to find out where they live. ■ Which fossils look like plants or animals that are alive today? ■ Compare fossils to living organisms. What can fossils tell you about past environments? Think, Talk, and Write Critical Thinking Why do we find fossils of ocean animals in Ohio? LS-4. Observe and explore that fossils provide evidence about plants that lived long ago and the nature of the environment at that time. 19 OHIO Ohio Life Sciences rons rhododend oak leav es 20 OHIO Ohio Cuyahoga Valley National Park Brandywine Creek is located in Cuyahoga Valley National Park in northeastern Ohio.
Find a way to model an organ system. Quick Check Compare and Contrast How is an organ different from a tissue? Critical Thinking Why do different living things need different organs? 31 EXPLAIN How can you see cells? Some things are too small to see with your eyes alone. Most cells are that tiny. Bacteria (bak•TEER•ee•uh) are the smallest cells of all! Scientists use microscopes to see bacteria and viruses. Microscopes To see most cells, you need to use a microscope (MY•kruh•skohp). A microscope works like a hand lens.
Then your muscle cells help move your leg. Cells Make Up Tissues In organisms with many cells, the ones that do the same job all group together. These cell groups form tissues (TISH•ewz). A tissue is a solid wall of cells that are alike. It is much like a wall made of bricks. Tissues Make Up Organs Tissues can also group together. When they do, they form an organ. The tissues in an organ work together to carry out a job. For instance, your heart pumps blood. Organs Make Up Organ Systems Organs work together in an organ system to perform a life function.