divides a cell into four new daughter cells, each with half as many
I
chromosomes as the parent cell.

Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures