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I．Fill in the blanks—Complete the following sentences with words from the readings.
1）A name for fossils that are very small is m _ _ _ _ _ _ _ _ _ _ _.
2）That volcano is not active．It is d _ _ _ _ _ _.
3） Sometimes there are too many v _ _ _ _ _ _ _ _ to understand why something happens.
4）Many animals have fur for i _ _ _ _ _ _ _ _ _.
5）Part of a paleontologist's job is e _ _ _ _ _ _ _ _ _.
II．Answer the following questions.
1）What are some things you have that need to be inflated?
2）What are some animals that have an increasing population?
3）In a good experiment, how many variables should there be?
4）What are some examples of microfossils?
5）What are some animals that have a lot of insulation?
III．What is it? Using the clues, tell what is being described.
1）a sticky, black substance：o _ _
2）it feeds on sugar：y _ _ _ _
3）someone who studies space：a _ _ _ _ _ _ _ _ _
4）flightless birds that live near Antarctica：p _ _ _ _ _ _ _
5）weather over a long period of time：c _ _ _ _ _ _