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(Science: ecology marine biology) Living in or on water for all or a substantial part of the life span (generally restricted to fresh water or inland waters).

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Re: Beneficial mutations vs harmful

... gene (given the correct environment) when the ''word'' is spelt. You will not be seeing desert-dwelling animals evolve flat, oar-like tails for aquatic locomotion because that would be a neutral or disadvantageous mutation, and it would not aid in the hypothetical species's survival, so it would ...

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by Coelacanth
Sun Oct 13, 2013 6:08 am
Forum: Evolution
Topic: Beneficial mutations vs harmful
Replies: 12
Views: 7426

Re: the harm of algae

... the death of them, because they have a short lifespan. And as they die, they take up oxygen in the water, which can disturb or even kill other aquatic animals or plants sharing the same habitat.

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by Rettajean
Wed May 29, 2013 6:34 am
Forum: Botany Discussion
Topic: the harm of algae
Replies: 2
Views: 3977

On the number of limbs.

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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by JackBean
Tue Feb 05, 2013 4:34 pm
Forum: Evolution
Topic: On the number of limbs.
Replies: 7
Views: 3724

Is evolution as simple as we think?

... 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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by thoffnagle
Thu Nov 29, 2012 7:39 pm
Forum: Evolution
Topic: Is evolution as simple as we think?
Replies: 38
Views: 21659

Book recommendation for exam

... 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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by bertstare
Sun Oct 21, 2012 2:19 pm
Forum: Zoology Discussion
Topic: Book recommendation for exam
Replies: 3
Views: 6158
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