The answer is the option "c" The eruptions are caused by an accumulation of gases that press under a volcano. The molten rock continues to generate upward pressure but can not advanced; this causes that its force increases with the passage of time, since it continues accumulating hot gases trying to come to the surface. Finally, the surface yields and a volcanic eruption occurs.
Two diverse species naturally breed an offspring, and selective preserves raver new traits in a given environment, (they evolve). I hope this helps.=^⊃
