If only a single member of a pair of chromosomes is present in a cell, it is a condition and is most likely a cell.

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

Contrast how pollination is different among gymnosperms and angiosperms.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?