ET Natural Selection 2/23/24

There are three species of birds on an island.  Bird A has a heavy bill for eating seeds.  Bird B has a pointed bill for eating insects.  Bird C has a sharp bill for eating both insects and seeds.  If all insects on the island suddenly disappeared, which bird or birds would be the LEAST affected? 

• Bird A
• Bird B
• Bird C
• Bird A and Bird B

What is the advantage of having different shaped beaks?

• To look different from other species.

• To be able to eat the food readily available in the environment.

• To protect itself against predators.

• To protect itself against prey.

What happens to new traits that HELP organisms survive over time?

• Nothing

• That trait becomes MORE COMMON in the population

• That trait becomes LESS COMMON in a population

• Equally common

If a new trait DOES NOT help an organism survive, what may happen to it?

• Not survive or reproduce

• Survive & reproduce

• Survive

• Die

In order for Evolution to happen you need

• Genetic Variation, Selective Pressure, and Inheritance

• Mutations, predators, inheritance

• Predators

• Selection

What most likely caused the finches on the Galapagos Islands to have beaks that were different from the finches on the mainland?

• There were different types of predators on the islands.

• The finches on the mainland could not fly high enough.

• There was no water on the islands.

• There were different food types on each island.