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Author Question: Microscopic crystals of silica form a hard rock called chert, which can be shaped to form sharp ... (Read 151 times)

j.rubin

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on: Jul 13, 2018
Microscopic crystals of silica form a hard rock called chert, which can be shaped to form sharp cutting edges.
  Indicate whether the statement is true or false

Question 2

Fossil evidence suggests that such land-dwelling arthropods as _____ had evolved by at least the Devonian.
 A)trilobites
 B)molluscs
 C)scorpions
 D)beetles
 E)spiders


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ergserg

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

True

Answer to Question 2

C


j.rubin

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Reply 2 on: Jul 13, 2018
Great answer, keep it coming :)

raenoj

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Reply 3 on: Yesterday
Excellent

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