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4 years ago

According to scientific evidence, earth’s earliest atmosphere lacked oxygen. Over time, oxygen was added to the atmosphere.

2 answers:

5 0

The following statements explain how oxygen was introduced into the earliest atmosphere of the Earth and how the presence of oxygen affected life on Earth.

B) Oxygen is needed to carry out many life processes. The addition of oxygen to the earth's atmosphere assisted with the development of eukaryotic organisms.

D) Photosynthesis was carried out as cyanobacteria evolved. Oxygen is a product of photosynthesis.

Travka [436]4 years ago

4 0

The correct answers are:
B) Oxygen is needed to carry out many life processes. The addition of oxygen to the earth's atmosphere assisted with the development of eukaryotic organisms.
D) Photosynthesis was carried out as cyanobacteria evolved. Oxygen is a product of photosynthesis.

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What would happen to sleet if the colder air below the cloud were replaced with warm air?

Black_prince [1.1K]

Answer:

(D) If the colder air were replaced with warm air, the sleet pellets would change to snowflakes in a solid state.

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3 years ago

David has sustained an injury to his neck that has resulted in the complete loss of sensation to the posterior side of his upper

slavikrds [6]

Answer;

Radial nerve

Explanation

-The nerve that is most likely to be damaged as a result of his injury is the radial nerve.

-The radial nerve is a nerve in the human body that supplies the posterior portion of the upper limb.

-It innervates the medial and lateral heads of the triceps brachii muscle of the arm, as well as all 12 muscles in the posterior osteofascial compartment of the forearm and the associated joints and overlying skin.

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3 years ago

Prior to the invention of refrigeration, meat was often preserved by soaking it in brine (a solution of water with a high concen

Anon25 [30]

Water would move out of the cells of the microorganisms by osmosis and the cytoplasm would become dehydrated, killing the cells.
The brine is a hypertonic solution, thereby "pulling" the water out of the bacterial cells.

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3 years ago

Read 2 more answers

Bacteria multiply by division.One bacterium becomes two. Then two divide into four the four divide into eight and so on For a ce

quester [9]

59 minutes

Explanation:

There is 1 hour (equivalent to 60 minutes) between 11.00pm and midnight.

Using the formulae; P (future) = P (present) * (1 + i)ⁿ where

P (Future) = Future Population

P (Present) = Present Population

i = Growth Rate

n = Number of generations

The bottle was full after 60 minutes and it was filed by the following number of bacteria

P(future) = 1 * (1+1)⁶⁰ = 1,152,921,504,606,846,976

A half-filled bottle would have half the number = 576,460,752,303,423,488

Using the same formulae to find after how many generations do we get to this number;

576,460,752,303,423,488 = 1 * (1+1)ⁿ

(576,460,752,303,423,488) / 1 = (2)ⁿ

n = log₂ (576,460,752,303,423,488)

n = 59

This means the bottle got full at 59 minutes.

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4 years ago

What are some reasons why your body needs food

bekas [8.4K]

Explanation:

to stay alive and to keep nutrients in your body and etc...

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3 years ago

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