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Author Question: How many mass extinctions do scientists believe have occurred on Earth? a. one b. two c. three ... (Read 90 times)

haleyc112

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on: Jul 13, 2018
How many mass extinctions do scientists believe have occurred on Earth?
   a. one
   b. two
   c. three
   d. four
   e. five

Question 2

How fast do comets travel?
   a. about 2 to 3 km per minute
   b. about 60 km per minute
   c. about 2 to 3 km per second
   d. about 60 km per second
   e. about 500 km per second


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nyrave

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Reply #1 on: Jul 13, 2018
Answer to Question 1

ANSWER: e

Answer to Question 2

ANSWER: d


haleyc112

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Reply 2 on: Jul 13, 2018
:D TYSM

daiying98

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Reply 3 on: Yesterday
Gracias!

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