The phase of cell division in which chromosomes align on the spindle equator halfway between the spindle poles is a. metaphase. b. telophase. c. anaphase. d. prophase.

Ans.

The stage of cell division, during which chromosomes, consisting of sister chromatids, have aligned on the spindle equator, halfway between the two spindle poles, is called as metaphase. During metaphase, an equatorial plate is formed, known as metaphase plate that allows the division of sister chromatids.  

Thus, the correct answer is option A). 'metaphase.'

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.