Which of the following must occur for speciation to happen?
geographic isolation
reproductive isolation
temporal isolation
behavioral isolation

The correct option is (B) reproductive isolation.

Further explanation:

Reproductive isolation must occur for speciation to happen. Reproductive isolation refers to when two or more groups of animals live together or close enough to interact but they are not able to interbreed. There are various reasons why organisms cannot mate, which can be divided into two categories: post-zygotic barrier and pre-zygotic barrier.

REPRODUCTIVE ISOLATION

A species is a collection or group of living organisms such as plants and animals that can exchange genes and interbreed. There are many reasons which separate or divide one population into two or more groups.  

Reproductive isolation can be referred as a collection of behavior, psychological processes and behaviors which prevent production of offspring after mating of two different species.

A species has ability to reproduce on which our biodiversity depends. If a species fails to reproduce then it will be disappeared. There are various factors that play an important role in it like climatic conditions of a particular region.

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Answer details:

Grade: High School

Subject:  Biology

Topic: Reproductive Isolation

Keywords: reproductive, isolation, post-zygotic, pre-zygotic, behaviors, biodiversity, genes, organisms, mating

c. reserves power to the states and people

answer; ///attempts to change more than once behavior at the same time;