A _______________ is a group of individuals capable of interbreeding to produce fertile offspring.

Approximately how many species have been described?

The key to speciation is _____________________of populations.

______________ speciation occurs when geographic isolation creates a reproductive barrier

_______________ speciation occurs when a reproductive barrier is created by something other than geographic isolation

Which one below is NOT a reproductive isolating mechanism?

Best estimates from the fossil record indicate that greater than ____% of species that have exited are now extinct.

The reproductive isolating factor that occurs when an egg and sperm are incompatible is refered to as

The reproductive isolating factor that occurs when individuals of a species mate at different times is refered to as

A typical “lifetime” for a species is about ____million years.

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