1.All ocean plants live about the depth of about 200m . Why?
2.Yawning(人名) is taking a deep breath . Why do we yawn when we are tired?
3.What organs are used by each of the following animals for gaseous evchange?
(a)bird) (b)frog (c)dolphin (d)fish
4.Why does saving energy reduce air pollution?
science
2008-09-27 3:06 am
回答 (1)
2008-09-29 3:56 am
✔ 最佳答案
1. All ocean plants are not able to live above 200m because buoyancy of water2. It is because when we yawn, the muscle is scratched and relaxed, thus muscle will become more comfortable.
3a: Lungs
3b:lungs
3c: lungs
3d: cheek
4: saving ener gy means less air(usually dirty) is released , thus air pollution is relieved.
參考: myself
收錄日期: 2021-04-13 16:06:49
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