Background: A period of very low rainfall occurred while the Grants were on the islands. The drought resulted in fewer seeds for the finches to eat. Birds with smaller beaks could eat only the smaller seeds. Birds with bigger beaks were better off. They could eat seeds of all sizes. Therefore, there was more food available to them. Many of the small-beaked birds died in the drought. More of the big-beaked birds survived and reproduced. Within just a couple of years, the average beak size in the finches increased. This was clearly evolution by natural selection.

Situation: Mark enjoyed walking in the fields and woods near his house. He had walked in the same area as a child and remembered seeing lots of white and brown moths. Now though he did not often see moths. One day while walking he realized that there were several brown moths on a tree after that he noticed them more often he realized that they were just harder to see against the brown trees.

Question: Which moth was better adapted to the environment?

Situation: Mark enjoyed walking in the fields and woods near his house. He had walked in the same area as a child and remembered seeing lots of white and brown moths. Now though he did not often see moths. One day while walking he realized that there were several brown moths on a tree after that he noticed them more often he realized that they were just harder to see against the brown trees.

Question: Which moth survived?

Situation: Mark enjoyed walking in the fields and woods near his house. He had walked in the same area as a child and remembered seeing lots of white and brown moths. Now though he did not often see moths. One day while walking he realized that there were several brown moths on a tree after that he noticed them more often he realized that they were just harder to see against the brown trees.

Question: Which moth was easier prey?

Situation: Mark enjoyed walking in the fields and woods near his house. He had walked in the same area as a child and remembered seeing lots of white and brown moths. Now though he did not often see moths. One day while walking he realized that there were several brown moths on a tree after that he noticed them more often he realized that they were just harder to see against the brown trees.

Question: Which moth was easier to see?

Situation: Mark enjoyed walking in the fields and woods near his house. He had walked in the same area as a child and remembered seeing lots of white and brown moths. Now though he did not often see moths. One day while walking he realized that there were several brown moths on a tree after that he noticed them more often he realized that they were just harder to see against the brown trees.

Question: Which moth was hader to see?

Situation: Mike was sitting in the yard of his new home when he noticed that there were a lot of squirrels in the area. Some of the squirrels were very good at gliding from tree to tree by spreading their legs apart the others often had to run across the ground and then climb another tree. Mark also observed several cats in the area watching carefully as the squirrels scampered across the ground to other trees.

Question: Which squirrels are most likely to be killed by the cats gliding or nongliding?

Situation: Mike was sitting in the yard of his new home when he noticed that there were a lot of squirrels in the area. Some of the squirrels were very good at gliding from tree to tree by spreading their legs apart the others often had to run across the ground and then climb another tree. Mark also observed several cats in the area watching carefully as the squirrels scampered across the ground to other trees.

Question: Which squirrels are least likely to be killed by the cats gliding or nongliding?

Situation: Mike was sitting in the yard of his new home when he noticed that there were a lot of squirrels in the area. Some of the squirrels were very good at gliding from tree to tree by spreading their legs apart the others often had to run across the ground and then climb another tree. Mark also observed several cats in the area watching carefully as the squirrels scampered across the ground to other trees.

Question: Does the gliding squirell have an advantage or a disadvantage?

Situation: Mike was sitting in the yard of his new home when he noticed that there were a lot of squirrels in the area. Some of the squirrels were very good at gliding from tree to tree by spreading their legs apart the others often had to run across the ground and then climb another tree. Mark also observed several cats in the area watching carefully as the squirrels scampered across the ground to other trees.

Question: Does the nongliding squirell have an advantage or a disadvantage?

Situation: Mike was sitting in the yard of his new home when he noticed that there were a lot of squirrels in the area. Some of the squirrels were very good at gliding from tree to tree by spreading their legs apart the others often had to run across the ground and then climb another tree. Mark also observed several cats in the area watching carefully as the squirrels scampered across the ground to other trees.

Question: In a few years will there be more or less gliding squirrels?

Situation: Mike was sitting in the yard of his new home when he noticed that there were a lot of squirrels in the area. Some of the squirrels were very good at gliding from tree to tree by spreading their legs apart the others often had to run across the ground and then climb another tree. Mark also observed several cats in the area watching carefully as the squirrels scampered across the ground to other trees.

Question: In a few years will there be more or less nongliding squirrels?

Situation: A species of flower was either white and violet. But the plants were dependent on bees to pollinate them and the bees were more attracted to the violet flowers.

Question: which flower is less likely to be pollenated?

Situation: A species of flower was either white and violet. But the plants were dependent on bees to pollinate them and the bees were more attracted to the violet flowers.

Question: which flower is more likely to be pollenated?

Situation: A species of flower was either white and violet. But the plants were dependent on bees to pollinate them and the bees were more attracted to the violet flowers.

Question: which flower is more likely to pass on it's genes?

Situation: A species of flower was either white and violet. But the plants were dependent on bees to pollinate them and the bees were more attracted to the violet flowers.

Question: which flower is likely to pass on it's genes?

Situation: A species of flower was either white and violet. But the plants were dependent on bees to pollinate them and the bees were more attracted to the violet flowers.

Question: Over time wich flower will be more common?

Situation: A species of flower was either white and violet. But the plants were dependent on bees to pollinate them and the bees were more attracted to the violet flowers.

Question: Over time wich flower will be less common?