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Afina-wow [57]
3 years ago
12

In a controlled experiment, which group experiences the test?

Biology
1 answer:
vekshin13 years ago
8 0

Answer:

A: the experimental group.

Explanation:

the experimental group does the experiments

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When did Cyanobacteria start producing pure oxygen
Travka [436]

<u>Answer:</u>

Cyanobacteria start producing pure oxygen around 200 million years ago.

<u>Explanation:</u>

Many scientists believed that Earth did not have any oxygen. Cyanobacteria or the blue green algae are the microbes which produced oxygen for the first time with the help of photosynthesis.  This was around 4.5 billion years ago: after Hadean eon.

They were very simple, but they produced oxygen in the early earth’s atmosphere. So, they brought evolution on earth. This “blue-green algae” exists in salt water, rocks and soils and play a major role in maintaining the ecosystem.

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ryzh [129]

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Explanation:

The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.

8 0
3 years ago
Phytoplankton are microscopic marine plants that perform photosynthesis. They are responsible for removing the majority of carbo
MAVERICK [17]

The correct answer is - oxygen.

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6 0
3 years ago
Technology affects the environment in many ways. Which negative impact is NOT due to advances in technology?
sergejj [24]

Answer:

d

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Im pretty sure that the answer is d because how could technology cause more NATURAL disasters and also i took the USATestprep

 

7 0
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