Extinction & Speciation Flashcards Preview

Unit 2 Biology (Higher) > Extinction & Speciation > Flashcards

Flashcards in Extinction & Speciation Deck (6)
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Give reasons why species become extinct.

Environmental changes, new predators, new diseases, competition, catastrophic events and new species develop.

1

What is a species?

A group of similar organisms that can produce fertile offspring.

2

What is speciation?

The development of a new species.

3

What is isolation?

When populations of a species are separated by, for example, a land barrier.

4

What is natural selection?

Where organisms that are better suited to their environment have a better chance of survival and so are more likely to breed successfully.

5

How does isolation create a new species?

Populations of a species are separated by a land barrier, like mountains. On each side, climates are different and so each population adapts to the climate. Eventually, one population adapts so much they become a new species because they cannot breed with the other to make fertile offspring.