Extinction (GCSE Biology)

Why is the fossil record incomplete, and how does this affect conclusions about past extinctions?

A sudden large reduction in the size of a population due to an environmental event can reduce genetic variation. What is this event called in evolutionary terms?

Which concept describes when a small group of individuals establishes a new population with different allele frequencies than the original population?

Which monitoring measure helps scientists estimate whether a species is at risk of extinction?

Which type of speciation occurs when geographic isolation (e.g., a mountain range or river) separates populations leading to reproductive isolation?

How can invasive non-native species increase the risk of extinction for native species?

Which statement best links evolution by natural selection to extinction?

How does reduced population size due to human hunting or collection make extinction more likely?

Which genetic mechanism can reduce the adaptive potential of a population and increase its extinction risk after inbreeding?

Which evidence from the fossil record supports the idea of evolution by natural selection?

What is a practical reason scientists might prioritise protecting a keystone species to prevent wider extinctions?