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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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An ecologist is studying Dunaliella Salina a single celled algae in a local pond. The con is located near construction site in t
faust18 [17]

Answer:

The electron microscope

Explanation:

<u>The microscope that would be best suited to study the inner structure of the chloroplast would be the electron microscope.</u>

<em>The electron microscope has a high magnifying property due to the fact that it uses a beam of accelerated electrons as a source of illumination, unlike the light microscope that uses visible light. While the light microscope might be enough to see the inner portion and the organelles of the cell, the tiny nature of the inner structure of the chloroplast means that the light microscope will not be able to view the details. A more powerful microscope like the electron microscope would be required.</em>

8 0
4 years ago
Between a Black father bear (genotype BB) and a Brown mother bear (genotype bb), they had several baby bears.Black fur allele (B
Karolina [17]

Answer:

100% or 1

Explanation:

This question involves a gene coding for fur color in bears. According to the question, black fur allele (B) is dominant over the brown fur allele (b). This means that a bear heterozygous for fur color (Bb) will be phenotypically black.

In this question, a black father bear (genotype BB) and a brown mother bear (genotype bb) were crossed, the baby bears will all have a genotype Bb (see punnet square in the attached image). Since all the offsprings of this cross have genotype Bb, this means that 100% will have black fur.

6 0
3 years ago
Geography the process in which nutrients are dissolved in water and percolate downward below the root zone of crops is called:
Karo-lina-s [1.5K]
Nutrient Leaching

Leaching is the process where dissolved nutrients in the soil profile moves downward with percolating water. It is the loss of water-soluble plant nutrients from the soil. The nutrients that seep through the rooting zone may be recycled if roots grow deeper.


6 0
3 years ago
Which of the following best describes what happens in genetic therapy?
Sedbober [7]

Answer:

Healthy proteins are inserted into a patient since their DNA does not produce the right proteins.

Explanation:

4 0
3 years ago
What effect did the capture of Vicksburg have upon the Confederacy?
Nina [5.8K]
The effect that the capture of Vicksburg had upon the confederacy was that the states west of Mississippi became completely isolated. The Mississippi valley states were no longer considered a great threat. This also opened the doors of invasion for the states that lied to the deep south. Vicksburg was an important place to capture in respect to its geographical position.
4 0
3 years ago
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