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Author Question: How long ago did multicellular life forms appear in the fossil record? A) 4.5 billion years ago ... (Read 106 times)

yoroshambo

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on: Jul 27, 2018
How long ago did multicellular life forms appear in the fossil record?
 
  A) 4.5 billion years ago
  B) 3.8 billion years ago
  C) one billion years ago
  D) 63 million years ago
  E) 30 million years ago

Question 2

Relate Herbig-Haro objects to the T-Tauri Wind.
 
  What will be an ideal response?


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djpooyouma

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

C

Answer to Question 2

In stage 5, the spinning protostar forms a dusty disk, but ejects material at high speeds along the bi-polar jets perpendicular to this disk. The shock wave from these high speed jets lights up the Herbig-Haro objects along a line over a light-year long in some cases.


yoroshambo

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Reply #2 on: Jul 27, 2018
Thank you!


djpooyouma

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Reply #3 on: Jul 27, 2018
Always glad to help...


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