Answer:
a. KCl
Explanation:
a. KCl - made of 2 elements
b. NH4Cl
c. KClO3
d. NH4ClO3
<span>Homeostasis is the upkeep of a consistent inner state in an evolving situation.
So as to survive the underneath ought to be required:
[1]your cells should have the capacity to get and utilize vitality
[2]make new cell
[3]exchange materials
[4]and wipe out squanders.</span>
C, fluorine. It will burn anything including concrete, already burnt material, etc.
https://www.youtube.com/watch?v=ckSoDW2-wrc
My guess is photosynthesis since that absorbs solar energy