Cells undergo mitosis because there must be a process in which the nucleus is divided in order for there to be a successful reproduction for cells.
Answer:
The fusion of a egg and a sperm produces a zygote with 46 (2n) chromosome number.
Buildup of organisms means that the species number is pretty high.
Gradual change means that it was a slow, calm time to make the change.
I hope this helps!!
Answer:
hydrogen bond
Explanation:
by weak electrical attraction between two polar molecule hydrogen bond is developed between them
the example is water molecule in case of water two water molecules are attracted toward each other by strong hydrogen bond which is developed between highly electronegative oxygen of one water and electropositive hydrogen of another water molecule