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julia-pushkina [17]
3 years ago
9

What is silicon, oxgyen, aluminum chemical composition. A. crust B. mantle C. cores​

Biology
1 answer:
PolarNik [594]3 years ago
5 0

Answer:

A. Crust

Explanation:

The most common chemical elements in the crust are oxygen (46.6%), silicon (27.7), aluminum (8.1), iron (5.0), calcium (3.6), potassium (2.8), sodium (2.6), and magnesium (2.1). These figures vary among different studies because we really have no way to know for sure.

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Carbon dioxide is added to the atmosphere:
devlian [24]
B.
When fossil fuels are burned carbon dioxide is released in to the atmosphere
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A species of a large brown bear lived in Siberia about a million years ago. Over time, the northern population became white-colo
svp [43]

Answer:

<em>e. speciation</em>

Explanation:

The definition of speciation is:  the evolutionary process by which populations evolve to become distinct species.

In this scenario, the bears that were once of the same species evolved in order to adapt to their environment. Once they evolved, they could no longer produce with each other, as they are now different species.

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3 years ago
What information would be most relevant to determining the time of death?
Nuetrik [128]

Lividity can be defined as the typical bluish-purple discoloration of the skin after death. Rigor mortis can be defined as the postmortem state in which the muscles become stiff.

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5 0
3 years ago
28. Which statement best explains why cellular respiration in plants and
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Answer: Photosynthesis provides the materials that fuel cellular respiration.

Explanation:

Photosynthesis, the process through which green plants convert light to chemical energy. The energy that is gotten from sunlight by green plants, some protistans, and bacteria is used to produce sugar which is then converted to ATP by cellular respiration which is regarded to as the fuel that living things use.

Therefore, the statement that best explains why cellular respiration in plants and other organisms is dependent on photosynthesis is that photosynthesis provides the materials that fuel cellular respiration.

8 0
3 years ago
Do you think animals pollinate flowers and disperse seeds on purpose or by accident?
Allushta [10]

Answer:

Animals most likely pollinate by accident.

Explanation:

Deer for example, they may graze in the grass. The pollen/seeds could catch onto their fur--and later fall off into a different area when they walk away. They could also eat a plant, and the seeds end up in their feces. Bees for another example don't necessarily <em>mean</em> to pollinate, they just happen to pick up pollen/seeds when they land on a flower for honey.

Hope this helps :)

6 0
3 years ago
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