Variations within a species are known as:

families
varieties
speciation
none of these

Answer:

Variation within a species is known as speciation.

Explanation:

Speciation is a process through which the group of organisms belonging to the same species evolves into slightly distinct species. It happens as a result of the natural selection. These natural selections of species are due to the changes in the habitat due to habitat fragmentation, the introduction of a new niche, and genetic polymorphism. These natural selection of species or natural speciation are of 4 types:

1) Allopatric

2) parapatric

3) peripatric, and

4) sympatric.  

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.