The common ancestors of birds and mammals were very early (stem) reptiles, whichalmost certainly possessed three­chambered hearts (two atria, one ventricle). birds andmammals, however, are alike in having four­chambered hearts (two atria, two ventricles).the four­chambered hearts of birds and mammals are best described as
a) structural homologies.
b) vestiges.
c) homoplasies.
d) the result of shared ancestry.
e) molecular homologies.

it's the cell cycle, but cytokines is when the cell divides.

theres 3 stages interphase,mitosis,and cytokines.

interphase prepares the cell for division.

mitosis is the process of dividing the cell,it has 4 parts interphase,anaphase,metaphase,and telophase.

lastly there's cytokines,that's when the cell divides into 2 daughter cells

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .