Which of the following is not an internal or external factor that controls cell division? a. When a neighboring cell grows, its cell membrane is touching its neighbor.
b. Signal receptors on the inside of the cell membrane detect overstretching of the cell
membrane when a cell gets too large.
c. chemical messengers like kinase and cyclin
d. Apoptosis is a special set of controlled steps in which a cell dies intentionally.

the correct answer in apex is tissue development, i know because i just had this question

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.