The model of speciation that requires some time with geographic barriers between two populations, allowing evolution of reproductive isolation, isa) allopatric speciation. b) phyletic gradualism. c) sympatric speciation. d) punctuated equilibrium. e) prezygotic isolation.

The answer is a) allopatric speciation.

Explanation:

Allopatric speciation happens when a geographical or physical barrier is introduced in a population. After this, the reproductive isolation, genetic recombination and also random mutations can promote the speciation process, where at the end, there will be two separate species.

showing a photograph would make this a hell of alot easier

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation: