Using your reflexes can prevent you from getting hurt in the first place.
Earth rotates from west to east.
What is different with retroviruses in reproduction is that they do not kill their hosts at first because they can still insert their own genome. This process is what is known the reverse transcription. This is done by different proteins.
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.B) You would place newborn curly-whiskered mud rats with bald mud rat parents and place newborn bald mud rats with curly-whiskered mud rat parents. Finally, let some mud rats of both species be raised by their own species. Then you would compare the outcomes.
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I would say that A is the correct answer. Foods release amino acids. Hope this helps. :D