Which pair of animals from the video had a commensalist relationship where one benefitted while the other was relatively unaffected?

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

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 a fossil fem that support wegener's hypothesis of continental drift a. gondwanded b. kannemerid c. mesosaurus d. glossopters