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

Reproductive isolation is necessary for speciation. It is a process by which new species of plants and animals are created.

Further Explanation:

Speciation is a technique used to create new kinds of plants and animals. It occurs when a group of species differ from other species and develop their new characteristics. They differ from their ancestors based on the environment they live in and characteristics.

The speciation is performed in five forms: allopathic, peripatric, sympatric and artificial. Allopatric speciation occurs when two different groups of species are formed from the single species. These two species are isolated from each other. Peripatric speciation occurs when an individual species break off from a large group and form a new species. Sympatric speciation occurs when a species cover a large geographical area. Artificial speciation is the creation of new species by a human.

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Answer Details:

Grade: High school

Subject: Biology

Chapter: Evolution.

Keywords:

Reproduction, isolation, speciation, species, ancestors, characteristics, allopathic, peripatric, sympatric, articial, geographical, plants and animal.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.