Extinction, Fossils and Natural Selection

Question 1

Extinction

Answer 1

The complete disappearance of a species from Earth

Question 2

Natural Selection

Answer 2

Process where organisms better adapted to their environment survive to breed and pass on their genes

Question 3

Fossils

Answer 3

The remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form

Question 4

Three types of fossils

Answer 4

Impression fossils
Preserved Organisms
Mineral Replacement

Question 5

How are Preserved Organisms made?

Answer 5

Small animals and plant matter sometimes become caught in resin as it is secreted from trees. The resin hardens to become amber leaving the organism preserved.

Question 6

What is mineral replacement

Answer 6

An animal dies and is buried by sediment. The sediment around the skeleton thickens and begins to turn to stone. The skeleton dissolves creating a mould in which minerals crystallise inside of. This creates a fossil which is then exposed to the earths surface. `

Question 7

Causes of extinction

Answer 7

Environment changes quickly 
A new predator
A new disease 
Competition with new species for food
A catastrophic event