4.4 - How do speciation, extinction, and human activities affect biodiversity? Flashcards
1
Q
speciation
A
When two species arise from one for many reasons.
2
Q
Geographic isolation
A
occurs when different groups of the same population of a species become physically isolated from one another for long periods
3
Q
reproductive isolation
A
occurs when mutation and change by natural selection operate independently in the gene pools of geographically isolated populations. (Produce so much the DNA becomes too different)
4
Q
Extinction
A
an entire species ceases to exist.
5
Q
Endemic species
A
Species that are found in only one specific area
6
Q
Background extinction
A
The extinction of species at a low rate
6
Q
mass extinction
A
a significant rise in extinction rates above the background level.
