Answer:
1. evolution
Explanation:
reproductive seperation hinders the capability of different species to produce an offspring and it also serve as a barrier to maintain integrity of each species wherein genes flow or reduced
My Answer: <span> lower than terrestrial planet densities, lower than the density of rock.
Hope I helped! :D
</span>
<span>One of her parents had type B blood and the other type A blood.</span>
Equilibrium is when the sum of the forces is zero.