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Author Question: The middle era of the geological history of Mars is called the A) Noachian B) Hesperian C) ... (Read 89 times)

soccerdreamer_17

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on: Jul 27, 2018
The middle era of the geological history of Mars is called the
 
  A) Noachian
  B) Hesperian
  C) Amazonian
  D) Phanerozonian

Question 2

Why might we think that silicon would be an obvious alternative to carbon as a building block for biological molecules?
 
  A) it forms the basis of some life forms on Earth
  B) it has a similar abundance on Earth to carbon
  C) it forms complex molecules like carbon
  D) it has a similar electronic structure to carbon, forming a maximum of four bonds and, hence, should have a similar chemistry


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djpooyouma

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Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

D


soccerdreamer_17

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Reply 2 on: Jul 27, 2018
Gracias!

bassamabas

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Reply 3 on: Yesterday
Excellent

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