Covalent bond is when two atoms share one or more pairs of electrons, an example of this could be H20 or C02.
ionic bonds are when one or more electrons from am atom are removed and attached to another, which can result in positive or negative ions which attract each other, an example of this could be table salt.
Defects in transcription factors underlie some forms of cancer.
D because it reflects all other colors
No, because the immune system is already battling with the virus or disease