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spin [16.1K]
3 years ago
8

What factor caused the appearance of oxygen?

Biology
1 answer:
Nookie1986 [14]3 years ago
8 0

Answer:

The appearance of free oxygen in the Earth's atmosphere led to the Great Oxidation Event. This was triggered by cyanobacteria producing oxygen which developed into multicellular forms as early as 2.3 billion years ago

Explanation:

To clarify what I said here are some questions to help!

How did oxygen first appear?

Whiffs in the air is how oxygen first appeared billions of years ago.

For the most part, scientists agree that oxygen, though lacking in the atmosphere, was likely brewing in the oceans as a byproduct of cyanobacterial photosynthesis as early as 3 billion years ago

When was oxygen found?

2.33 billion years ago

Since its first appearance 2.33 billion years ago, oxygen accumulated in high enough concentrations to have a weathering effect on rocks just 10 million years later.

I don't know if this helped you but if it does, please let me know!

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What tissue makes up most of the wood of a tree? A. primary xylem B. secondary xylem C. secondary phloem D. vascular cambium
Over [174]

<u>B. Secondary xylem</u> tissue makes up most of the wood of a tree.

<h3><u>What exactly is secondary xylem?</u></h3>

Secondary xylem is a sort of xylem produced by secondary growth. During initial growth, in contrast, the primary xylem develops. As a result, the secondary xylem is linked to the primary xylem by lateral growth as opposed to the vertical extension.

The kind of cambium that gives rise to each difference is another point of differentiation. The vascular cambium produces the secondary xylem, while the procambium produces the primary xylem.

Unlike trees and shrubs, non-woody plants lack secondary xylem. It gives such plants mechanical support by depositing lignin into their cell walls, thickening them. Compared to the major xylem, the secondary xylem is made up of tracheids and veins that are shorter and wider. In comparison to the primary xylem, it is also richer in xylem fibers.

Possible growth rings in the secondary xylem (or annual rings). Sapwood and heartwood are two differentiators of the secondary xylem in big woody plants.

Learn more about secondary xylem with the help of the given link:

brainly.com/question/703995

#SPJ4

4 0
1 year ago
PLEASE HELP!!!
VikaD [51]
The answer is A: Mass extinction.

"Abrupt disappearance of many land and marine species" = extinction of many species.


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Tadpoles use ____________________ to obtain oxygen.
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Plzzzzz help meeeee plzzzzzzz
Nutka1998 [239]

Answer:

59 is false and 60 and true

Explanation: I think it is right sorry if it is wrong. I hope this helps

3 0
2 years ago
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