By Wendie Hensley M.A., Annette Licata M.A.
Effortless tuition scholars who locate technology mystifying, daunting, and difficult to appreciate will switch their minds after they open this booklet. The authors have remodeled basic clinical rules into a thrilling event the place they realize how plant and animal existence engage in the Earth's atmosphere, how strength is switched over into warmth and movement, how subject exists in sturdy, liquid, and gaseous states, how mild is mirrored and refracted, how magnetism and electrical energy are comparable, how the Earth revolves round the solar, how the Moon revolves round the Earth, how other forms of rock have been shaped, and the way the Earth's floor has been shaped and formed over a interval of many billions of years. The student-friendly textual content is complemented with instructive line artwork.
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If you leave uncooked meat on the kitchen counter overnight, it will begin to smell funny. ) It smells funny because bacteria have begun to break down the meat. Have you ever taken a cucumber out of your refrigerator only to find that it feels slimy? Those are bacteria at work decomposing the vegetable. This also happens in nature. Not just in your kitchen. 43 7-3719_PnlsJrScience_PartI 5/25/07 3:21 PM Page 44 THE CIRCLE OF LIFE Insects can act as decomposers in nature. When an animal dies, insects are the first decomposers to get to work.
The type of animals living in an ecosystem depends on the surrounding habitat, plants, insects, and all of the non-living parts listed above. An ecosystem is always changing. Sometimes a change can be bad for the ecosystem. If a plant or animal enters an ecosystem in which it does not belong, the whole ecosystem may suffer. If someone decided to let loose their pet rabbits into a park, the rabbits may eat plants that were supposed to be for animals that live in the park’s ecosystem. Then the park animals may not have enough food to eat.
Remember you are the top of the food chain because nothing eats people as a regular part of its diet. Elephants need 220 to 440 pounds of food every day. A blue whale, the largest mammal on the planet, will eat up to 8000 pounds of krill every day for 4 months. The rest of the year is spent traveling and breeding. What’s Online Try these websites to find out more about food chains and food webs. htm 40 7-3719_PnlsJrScience_PartI 5/25/07 3:21 PM Page 41 DECOMPOSERS DECOMPOSERS What You’ll Find TERMS AND DEFINITIONS Decomposer Definition: Decomposers are living things that feed on and break down dead plants or animals.