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Author Question: Today, there are over 270,000 plant species with conductive tissues and material flow systems known ... (Read 306 times)

kaid0807

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on: Jul 14, 2018
Today, there are over 270,000 plant species with conductive tissues and material flow systems known as
 
  A) vascular plants. B) xeriphytes. C) blue-green algae. D) cyanobacteria.

Question 2

The gaseous oxygen in Earth's early atmosphere was a by-product of
 
  A) photosynthesis.
  B) photochemical reactions breaking down ozone (O3 ) to form oxygen (O2 ).
  C) volcanic outgassing.
  D) decay of organic matter.


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Jevvish

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Reply #1 on: Jul 14, 2018
Answer to Question 1

A

Answer to Question 2

A


kaid0807

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Reply #2 on: Jul 14, 2018
Thank you :)


Jevvish

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Reply #3 on: Jul 14, 2018
Happy to help you


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