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Tema [17]
4 years ago
9

Which was least likely to have been a component of Earth’s atmosphere before life began?A-sulfurB-carbon dioxideC-oxygenD-water

vapor
Biology
1 answer:
Burka [1]4 years ago
8 0

The correct answer is Oxygen.

The surface of the Earth was liquefied. As the Earth cooled, an atmosphere generated primarily from gases erupted from volcanoes. It constituted methane, hydrogen sulfide, and ten to 200 times as much as carbon dioxide in comparison to today's atmosphere.

It was considered that there was an extreme volcanic activity for the initial billion years of the existence of the Earth. The initial atmosphere was possibly majority carbon dioxide will no or little concentration of oxygen. There were slight quantities of ammonia, water vapor, and methane.

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How are fossils different
tamaranim1 [39]

Answer:

divide them into two major types - body fossils and trace fossils.

Explanation:

3 0
3 years ago
While looking at a sample of blood in a microscope, you see a purple-stained cell that is markedly larger than a red blood cell
alex41 [277]

Answer:

Monocytes

Explanation:

Monocytes are the agranular white blood cells. These are the large cells with 10-24 micrometer diameter and are characteristic by the presence of kidney-shaped, round or lobed nuclei. The cytoplasm is blue-gray due to the presence of azurophilic granules. Cytoplasm gives a foamy appearance.

The azurophilic granules are very minute in size and are actually the lysosomes. Monocytes migrate from the blood into the tissues and differentiate into macrophages. Since the observed purple stained cells were large in size than RBCs (7-8 micrometer in diameter), have a kidney shaped nucleus, they are monocytes.

3 0
3 years ago
In the rock cycle, rocks can change into three different forms. These are _____. igneous, cemented, and sedimentary granite, sed
irina [24]
Igneous, sedimentary, and metamorphic
4 0
3 years ago
Read 2 more answers
A meander that has been cut off from the river becomes a
babunello [35]
Salutations!

A meander that has been cut off from the river is called oxbow lake. I will now give an explanation on how an oxbow lake is formed.

An oxbow lake is a narrow U-shaped lake near a river. Its a meander that got cut off.

As erosion, continues, the neck of the meander is worn away. It gets narrower and narrower. Then, during flooding, the river takes a shortcut - straight across the neck. Soon the loop of the meander gets sealed off. It turns into an oxbow lake. In time, the lake will get covered with weeds, and fill with soil, and disappear. 

Hope I helped (:

Have a great day!
3 0
3 years ago
Why do scientists think the fossil record is incomplete?
meriva

I hope this helps the answer is A

6 0
4 years ago
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