Ecological succession describes a typically natural change over time of species within a community or ecosystem. These changes result in some species becoming more abundant while others may undergo a decline.

Genetics is the study of genes and inheritance in living organisms.

What is DNA

Introduction to Genetics

Meiosis 1

Meiosis 2

Natural selection is the adaptation strategy of living organisms on Earth. It occurs when they acquire and evolve a trait with time that provides them a distinct advantage for their survival and reproduction over other organisms in the population.

adaptation, in biology, the process by which a species becomes fitted to its environment; it is the result of natural selection’s acting upon heritable variation over several generations. Organisms are adapted to their environments in a great variety of ways: in their structure, physiology, and genetics, in their locomotion or dispersal, in their means of defense and attack, in their reproduction and development, and in other respects.

The variety of life found in a place on Earth or, often, the total variety of life on Earth. A common measure of this variety, called species richness, is the count of species in an area.