The number of covalent bond an element can form depends on the number of electrons it has in its outermost shell (valence electrons). Carbon has four valence electrons, therefore, it can form maximum of four covalent bonds in an organic compound.
If I had to guess, I would say both are light reactions.
B is representing photosystem 1, while C is representing photosystem 2
I could probably give a more confident answer if there were some labels or a key to describe the symbols given in the diagram. Hope this helps!
The answer would be B increasing population correlates with habitat size
Primordial soup is a theory created by the biologist Alexander Oparin, it established that life originated in a pond or an ocean as a result of chemicals combinations produced by the earths atmosphere and some forms of energy to make amino acids, the building blocks of proteins, which would then evolve into all species
