Study the image of the fossil shown below. how might a scientist use this fossil to learn more about the history of life on earth?

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

Is there any solid scientific evidence that humans have been cloned?

Which is the best example of plant tissue? the answer is d (just took the test)