Movement of molecules from an area of lower concentration to one of higher concentration with carrier molecules, using energy, is called

a.
osmosis

b.
mitosis

c.
diffusion

d.
active transport

i think slash and

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

what is the question here. i think you messed up.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.