The answer is B, bird flu. The other diseases have been around much longer than bird flu has. Bird flu has been in Asia since 2003, but didn't reach Europe and the middle east until 2005, making bird flu a very new disease.
A cell is the building block of an organism, or the smallest unit of life. The creatures inside provide food and energy to us, because we can't make our own energy.
I think its a transcription (srry if im wrong)
I believe its 2-3 oz. I'm not all that sure but after a bit a research it was the best answer i could get.
D, because skin tans to help us stand being in the sun without getting burned.
An example of physiological adaption is being able to digest milk. Before, humans were not able to digest milk before we developed enzymes that now make us have the ability to do so, thus allowing us another food source.
