What happens when rainwater hits sand? 1. Makes it evaporate
2.it moves it
3.it weathers it
4.it turns into acid precipitation

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

i dont know it at allnow im just getting points at this pint

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.