Dogs

Panda bears

Snakes

Jellyfish

The most common beak depth of the initial population (red bars) was 8.8 mm. A very small proportion of individuals with this beak depth survived the drought.

More than half of the initial finch population died during the drought.

The most common beak depth of the surviving population (black bars) was 10.3 mm. Less than a quarter of individuals with this beak depth from the initial population survived the drought.

Finches with larger beaks had a survival advantage in the 1977 drought.

The average beak depth of the 1978 offspring population is larger than that of the original 1976 population.

The finches that survived the drought (black bars in first graph) had offspring (red bars in second graph) with on average much larger beaks than their parents.

The offspring (red bars in second graph) had a smaller range of beak depths - from smallest to largest - than their parents (black bars).

The size of the offspring population in 1978 is much larger than the initial 1976 population, before the drought.

True

False

True

False

True

False

True

False

True

False

species will adapt no matter what the environment

environment has no effect on the survival of an organism

Individuals with favorable variations survive and reproduce

Insecticides cause mutations that are passed on to the next generation

They could hide in the birds shadow.

They could push the white moths into the flames.

They did not have a survival advantage.

They blended in with the dark tree trunks.