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belka [17]
3 years ago
8

why do scientists believe that life first emerged from the ocean and onto land well after the ancestors of modern day cyanobacte

ria populated the earth
Biology
2 answers:
Over [174]3 years ago
8 0
These bacteria used visible light energy to create chemical energy, expelling oxygen that was converted to ozone. The ozone blocked the Sun's harmful UV radiation from reaching the ground
nata0808 [166]3 years ago
6 0

Answer:

Since the ancestors of modern day cyanobacteria added oxygen to the primitive reducing atmosphere of earth.

Explanation:

The primitive atmosphere of the earth did not have oxygen. So, life was not possible on land. The ancestors of modern-day cyanobacteria had the ability to carry out oxygenic photosynthesis which in turn releases oxygen as a by-product. Hence, these ancestors of modern-day cyanobacteria populated the land and added oxygen to the atmosphere of the earth.  

Once enough oxygen was added to support the other life forms, aquatic life forms gradually started occupying the land habitats.  

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Explanation:  

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True or false: even though ozone protects us when we are breathing it near the ground, it is harmful to us when it is high up in
Otrada [13]

Answer:

False.

Explanation:

  • Ozone is a triatomic gas.
  • Each molecule of ozone is made up of three atoms of oxygen.
  • Ozone is an extremely important gas in the atmosphere as it absorbs the maximum of incoming solar radiation and the ultraviolet rays of the sun.
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  • Inhaling a significant amount of this gas can cause death.
  • Hence the given statement is False.
  • The correct sentence is:

Ozone protects us when it is high up in the atmosphere, it is harmful to us when we are breathing it.

8 0
3 years ago
Which statement best describes what happened when Constantine tried to establish "New Rome"?
saul85 [17]
D. He was successful in building s new political center in the East, unified by the Christian religion.

This question refers to the Byzantine Empire, which lasted past the fall of the Western Roman Empire.
8 0
3 years ago
Cystic fibrosis is genetic, meaning it can be
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Answer:

Deletion.

Explanation:

Cystic Fibrosis is caused by a Deletion Mutation in Chromosome 7. It is a recessive disorder that is hereditary.

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