Only population 2 will survive because it is the only population with variation.

All the populations will survive because the hummingbirds will change the length of their beaks if they need to.

 Populations 1 and 2 will survive.

 Populations 2 and 3 will survive.

 The water became warm. As a result, ducks with thin feathers were more likely to survive, so the ducks with thick feathers changed to have thin feathers.

The water became warm. As a result, ducks with thin feathers were more likely to survive, so both kinds of ducks passed on the gene for thin feathers to their offspring.

The water became warm. With each generation, more ducks with thin feathers survived long enough to pass on the gene for thin feathers to their offspring

You cannot tell how the environment changed. With each generation, more ducks passed on the gene for thin feathers to their offspring.

The population in Niger has the largest number of tall giraffes.

The population in Somalia has the largest number of tall giraffes.

Both populations have the same number of tall giraffes.

These bar graphs do not show which population has more tall giraffes

 Populations 1 and 2 will most likely survive.

Populations 2 and 3 will most likely survive.

Only Population 2 will survive because it is the only population with variation.

All the populations will survive because the seals will change the thickness of their blubber if they need to.

You cannot tell how the environment changed. With each generation, more guppies passed on the gene for small spots to their offspring.

The rocks became smaller. With each generation, more guppies with small spots survived long enough to pass on the gene for small spots to their offspring.

The rocks became smaller. Guppies with small spots are more likely to survive, so the guppies with large spots changed to have small spots.

 The rocks became smaller. Guppies with small spots are more likely to survive, so both kinds of guppies passed on the gene for small spots to their offspring

The cactuses in 1970 had smaller spines than the cactuses in 2015.

The cactuses in 1970 had larger spines than the cactuses in 2015.

There were more cactuses in 1970 than there were in 2015.

There was more variation in spine size in 1970 than there was in 2015.

You cannot tell how the environment changed. With each generation, more squirrels passed on the gene for black fur to their offspring.

 There were more black trees. Squirrels with black fur are more likely to survive, so the squirrels with gray fur changed to have black fur.

There were more black trees. Squirrels with black fur are more likely to survive, so both types of squirrels passed on the gene for black fur to their offspring.

There were more black trees. With each generation, more squirrels with black fur survived long enough to pass on the gene for black fur to their offspring

 All the populations will survive because the lizards will change the length of their legs if they need to.

Populations 1 and 2 will most likely survive.

 Populations 2 and 3 will most likely survive.

Only Population 2 will survive because it is the only population with variation

No blue jays could have been born with a thin-beak trait because none of the adult blue jays had that trait to pass down.

No blue jays could have been born with a thin-beak trait in the past, but some with that trait could be born in the future if the environment changes to have pine cones with seeds

A blue jay could have been born with a mutation in its genes for the thin-beak trait and lived for a little while, but it would have been more likely to die before it had offspring

A blue jay could have been born with a mutation in its genes for the thin-beak trait, but having a mutation in its genes would have caused it to die when it was born

These bar graphs do not show the amount of variation in the population.

There was the same amount of variation in spot size 40 years ago and last year

There was more variation 40 years ago.

There was more variation last year

Populations 1 and 2 will most likely survive.

Populations 2 and 3 will most likely survive.

Only Population 2 will survive because it is the only population with variation.

All the populations will survive because the foxes will change the color of their fur if they need to.

True

False

You cannot tell how the environment changed. With each generation, more seals passed on the gene for thick blubber to their offspring

The water became colder. Seals with thick blubber are more likely to survive, so the seals with thin blubber changed to have thick blubber.

The water became colder. Seals with thick blubber are more likely to survive, so both kinds of seals passed on the gene for thick blubber to their offspring.

The water became colder. With each generation, more seals with thick blubber survived long enough to pass on the gene for thick blubber to their offspring.

 There is more variation in height of the giraffes found in the wild.

 There is more variation in height of the giraffes found in the nature preserve.

The giraffes in the wild are mostly shorter than the giraffes found in the nature preserve.

The giraffes in the wild are mostly taller than the giraffes found in the nature preserve.

There was the same amount of variation in 1960 and in 2010

These bar graphs do not show the amount of variation in the population

There was more variation in 2010.

There was more variation in 1960.

 Prediction 1 is best. Two yellow or red snakes had a baby with a mutation in its genes for the green-skin trait. Because green snakes are more likely to survive, that baby survived long enough to pass on its mutation, so the green trait became more common over generations.

Prediction 1 is best. Green snakes are more likely to survive, so yellow and red snakes began to have offspring with mutations in their genes for the greenskin trait so that their offspring would have a better chance of surviving.

Prediction 2 is best. A snake could have been born with a mutation in its genes for the green-skin trait and lived for a little while. Because green snakes are more likely to die, it would have been more likely to die before it had offspring, so the final population will only have yellow and red snakes.

 Prediction 2 is best. A snake could have been born with a mutation in its genes for the green-skin trait, but having a mutation in its genes would have caused it to die when it was born, so the final population will only have yellow and red snakes.