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Anni [7]
3 years ago
6

What do scientists use to mark boundaries in the geologic time scale?

Biology
1 answer:
tekilochka [14]3 years ago
3 0

Era is used to mark the boundaries of geological time scale by using radio carbon dating technique.

Explanation:

Geological time starts with Precambrian time.

Geologically, time is divided between the Precambrian era and present time into era.

The three eras are Paleozoic era, Triassic period and Cenozoic era.

Era is further divided into periods.

Scientists use radio carbon dating to study fossils and rock formation. With this study they were able to divide them in exact geological scale.

Geologic scale is the record of events in earth's history and evolution.

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Answer:

Myogenic mechanisms

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Explanation:

Myogenic mechanisms work in the arterioles that serve the glomerulus.

They cause the smooth muscle cells in the arterioles to contract and relax in response to blood pressure changes.

The sympathetic nervous system increases blood flow through the kidneys during resting conditions.

At times of stress, it decreases blood flow through the kidneys, making it more available to the rest of the body.

The hormones angiotensin and aldosterone regulate blood volume by controlling retention of Na⁺ and water.

C is wrong. The parasympathetic nervous system mainly controls visceral organs such as glands.

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