B15.6 Fossils and extinction Flashcards
What does the fossil record show?
How organisms have changed over time
What is extinction?
Permanent loss of all the members of a species
What are the reasons for Mass extinction?
Change in climate
Melting sea ice
Volcanic eruption
Asteroids
How can predators wipe out a species?
Predators have an advantage due to the prey not having adaptions to avoid them - they can eat their eggs and hunt them down
How can diseases wipe out a species?
The species is not adapted to face the disease therefore will die due to not having certain responses to i
How can competition cause extinction?
New mutations can give one of organism a real advantage over another or sometimes new species introduced into an environment by mistakes
This means most successful competition can take over
Why can extinction happen?
New predators
New disease
Successful competition
