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Shkiper50 [21]
3 years ago
8

The oxygen build-up in the atmosphere was caused by

Biology
1 answer:
Y_Kistochka [10]3 years ago
3 0

Answer:

Actually, The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. "What it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billon years ago. Harmful cyanobacteria blooms may affect people, animals, or the environment by: y blocking the sunlight that other organisms need to live. Cyanobacteria blooms can steal the oxygen and nutrients other organisms need to live. y making toxins, called cyanotoxins.

Explanation:

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7 0
3 years ago
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Bogdan [553]

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5 0
3 years ago
Read 2 more answers
Helpppppppp with Q2 Q3 Q4 and Q5.
chubhunter [2.5K]

Answer:

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Explanation:

a flood carries soil and rock with it which proves 2 c is the only physical change which proves 3 waves beak stones they don't combine 4 and more rainfall means more erosion so more sediment proves 5 the other answers on 5 is contradictory

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3 years ago
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8 0
3 years ago
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