A population of tigers lives in Bangladesh. Over 50 years, the size of the tiger population increased. What best explains the increase in the size of the tiger population?

• A lot of tigers were born and none of them died.

• Fewer tigers were born than died.

• The tiger population is always increasing because no animal eats tigers.

• More tigers were born than died.

Scientists have been studying the size of three populations in a grassland. In this ecosystem, lizards eat fireflies, and fireflies eat gnats (a type of insect). The data showed that all three populations were stable. Then the lizard population decreased suddenly. What will most likely happen to the size of the firefly population as a result?

The firefly population will . . .

• increase because there are less lizards eating them.

• decrease because there are more lizards eating them.

• stay the same

• increase because there will be more energy storage molecules available for the fireflies to eat.

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In our Amplify unit question, what are we trying to answer?

• Why are there so many different species living in Glacier Sea?

• How has climate change affected Glacier Sea?

• Why is the moon jelly the only type of jelly in Glacier Sea?

• Why did the population of moon jellies in Glacier Sea mysteriously increase?

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An ecosystem is made up of ______ .

• living things and their offspring

• nonliving things such as rocks and soil

• living things and nonliving things

• many types of animals

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Which picture accurately shows a "population"?

• 
• 
• 
• 

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Within a population, organisms are always…

• eating and sleeping.

• being born and growing up.

• being born and dying.

• dying of old age and eating other things.

What is a scientific word that refers to new organisms being made?

• Reproduce

• Renovate

• Expire

• Subsist

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What causes a population size to increase?

• The number of births is greater than the number of deaths.

• The number of deaths is greater than the number of births.

• The number of births and the number of deaths is equal.

A large population of squirrels lives in a forest. In the last 50 years, the size of the squirrel population has stayed the same. What must be true about the squirrel population during the last 50 years?

• No squirrels were born and no squirrels died.

• Humans started protecting the squirrel population so they stopped dying.

• The squirrels did not have any baby squirrels during these years.

• The number of squirrels that were born was the same as the number of squirrels that died.

An organism that is killed and eaten by another organism

• Predator
• Prey
• Competition
• Adaptation

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