The term microevolution represents a predictive theory of how species might change with time.
The term macroevolution assumes that nature can create whole new structures and organisms simply be the environmental constraint.
Evolutionary biology, genetics, aetiology, genetics they overlap with the closely related sciences of ecology.
Ecology seeks to explain the movement of materials and energy through living communities, successional development of ecosystem and processes, adaptation and interactions.
The horrific forced transport of Africans into America during the age of exploration as part of the slave trade that was going on where Africans were transported on ships from Africa, chained up like animals all the way to America was an example of international migration affecting the population.
External influences forced Africans to go from Africa to another continent and live there.
Water fills up spaces under ground because it has no natural shape or size water is infinite so it fills the space of the area it is in such as a bath tub the water fills the shape of it or fills the area of it and then when someone get in it adjusts to the shape of them making the water rise
The leaves of plants have layers that perform different functions. The palisade layer contains the chlorophyll, which carries out most of the photosynthesis in the leaf.
In the palisade layer, the cells are arranged in an upright fashion. This means the light has no choice but to pass through the cell length ways which increases the chances of light hitting a chloroplast and subsequently being absorbed.
The spongy layer which is below the palisade layer has fewer chloroplasts and serves to catch the light that was not captured by the palisade layer.