Aquatic

Because it's not so easy to gain or lose limbs. Even aquatic mammals which seem to have no limbs, have still rudimentary legs. In other words, it is easier to change something than to gain or lose it.

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... time and see a direction - e.g., from small dinosaurs without feathers to those with feathers to birds that can fly and back to lack of flight in aquatic penguins. However, we cannot predict (and neither can evolution) what traits will be beneficial in the future. If the traits weren't available, ...

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... of birds; flight adaptation, migration. 17. Mammalia : Origin of mammals; denitition; general features of egg-laying mammals, pouched-mammals, aquatic mammals and primates; endocrine glands and other hormone producing structures (pituitary, thyroid, parathyroid, adrenal, pancreas, gonads) and ...

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... There are a bunch of possible answers to the first one, but yours isn't. The second one looks fine. The third one - that property of water affects aquatic ecosystems, but in anything but very large organisms, it's pretty irrelevant. 4 - a only applies to simple carbs, but who knows what they're ...

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I'm struggling with the following 2 questions. Can someone help please explain this to me? I'd really appreciate it. Question 1 Two aquatic plants were grown in either water or water containing a microtubule inhibitor for 24 hours. The roots were dissected and stained for DNA. The researcher ...

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