During the entire month of June, temperatures increase in the Northern Hemisphere and decrease in the Southern
Hemisphere.
What causes these temperature changes?
The Sun reaches its lowest point in the sky.
The Sun reaches its highest point in the sky.
The north end of Earth's axis is tilted toward the Sun.
The south end of Earth's axis is tilted toward the Sun.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.

cell division is not regulated in tumor cells.

friedrich meischer discovered it in white blood cell