B4

Question 1

Meaning of natural selection

Answer 1

Survival of the fittest

Genetic variation bc of diff in alleles rise thro mutations

Question 2

What things act as selection pressures?

How they affect an organism?

Answer 2

Predators
Competition for resources like food
Disease
They affect an organisms chance of survivi g and reproducing
Better Adapted to s pressures
Better chance of survival and breed
Useful allels passed on to nxt generation
Beneficial characterists become more common over ti.e

Question 3

Explain how bacteria shows evolution

Answer 3

Some able to resist antibiotic and reproduce

Better adapted to e and trait becomes common over time

Question 4

How do fossils provide evidence for evolution?

Answer 4

Arrange them in c order shows gradual changes in organisms