Don't rlly know u but kinda have been thinkin bout u... lol that prlly sounds weird

How does the study of genetic disorders such as pku biologists understand normal alleles?

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Some substances but not other can cross the (blank) membrane of a cell