<span>Sumerians built walls using the natural resource they were surrounded with, which was namely clay. They used this clay to create fired mud-bricks, as there was not any other building stone available at the time. However, the clay mud-bricks proved to be a solid structure for town fortification.</span>
Prey-predator relationship. Explanation: The relationship between the praying mantis feeding on a bee.
In frogs, different mating seasons are a barrier to reproduction.
A gene is (in informal use) a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
The answer is ‘behavioral isolation’. It is a form of
sympatric speciation - which occurs even when
species live in the same habitat. In this case,
the individuals in the population are isolated by differences in mating and probably different mating rituals.
