Which of the following pairs of elements can be joined by a covalent bond? A. Na and C
B. Mg and Cl
C. O and N
D. N and Be

why is cellular respiration important for homeostasis?

it changes food into energy that the organism can use.

which of the following is most likely to happen if a cell is not able to divide?

the cell will not be replaced when it is damaged.

explanation:

a polar bond is formed when electrons are shared unevenly between atoms

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?