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tester [92]
3 years ago
9

What are the two subdivisions of the Precambrian Era called?

Biology
2 answers:
Irina-Kira [14]3 years ago
6 0
Archean and Proterozonic which are both broken into early middle and late periods
erik [133]3 years ago
5 0

Answer:

Two major subdivisions of the Precambrian era are Archean and Proterozoic.

Explanation:

The whole period of earth before the formation of the oldest rocks is known as the Precambrian period. It comprises all geological time before 600 million years ago. The two major subdivisions of the Precambrian period are-

1. Archean - It is an older subdivision of the Precambrian period prior to 2500 million years ago. It can be divided into early, middle and late.

Most abundant fossils are found during this period. In this period microfossils of photosynthesizing bacteria known are found.

2. Proterozoic- It is the second major subdivision of the Precambrian period prior to 600 million years ago up to 2500 million years ago. Traces of the Edicara fauna, bacteria, and blue-green algae and first oxygen dependent life-form are found in the Proterozoic period.

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In the northern hemisphere, winds associated with a low-pressure system system blow ___. ?
Lelu [443]
<h3><u>Answer;</u></h3>

A. counterclockwise toward the center

<h3><u>Explanation;</u></h3>
  • <em><u>In the Northern Hemisphere, winds associated with a low-pressure system blow in a counterclockwise direction towards the center, while those that are associated with a high-pressure system blow in clockwise direction outwards from the center.</u></em>
  • In the Southern Hemisphere on the other hand, winds that are associated with a low-pressure system blow clockwise towards the center.
  • <em><u>The rotation of the earth creates a force called the Coriolis force, which gives the wind that is within high pressure systems a clockwise circulation in the northern hemispheres and a counterclockwise circulation in the southern hemisphere.</u></em>

7 0
3 years ago
Read 2 more answers
In the term trace element, the adjective trace means that
Margarita [4]

Answer:

The elemental is required in very small amount. (Ans. A)

Explanation:

Trace element is also known as micro-nutrient. It is also defined as any chemical element required by living organisms in a minute or small amounts which is usually part of the vital enzyme (cells produced by catalytic protein).

Exact needs of trace elements vary among species, like commonly required plant trace elements are cooper, zinc, manganese, boron, and molybdenum. Animals commonly required iodine, manganese, and cobalt.

Absence of necessary plant trace elements required by plants in the soil causes deficiency disease, lack of animal trace elements used by animals in the soil may not harm plants, but, animals feeding on those plants develop their deficiency disease.

So, the adjective trace means that the elemental is required in a very small amount.

7 0
3 years ago
How does the earth's rotation influence the global circulation pattern set up by uneven heating?
Serhud [2]
The earth's rotation influences the global circulation pattern set up by uneven heating by breaking two circulation cells into four cells. The correct answer is D. <span />
8 0
3 years ago
What gas was non existent 2.5 billion years ago
gogolik [260]
Fossil fuel was non existent 2.5 billion years ago
7 0
3 years ago
The advantage of having many nuclei in a skeletal muscle fiber is:
HACTEHA [7]

Answer:

Option (D).

Explanation:

Skeletal muscles is one of the most important types of muscle that regulate the contraction of skeletal muscles of the body. The skeletal muscle is controlled by the somatic nervous system.

Skeletal muscles are multi nucleate contains large number of nucleus in their structure. The multiple nucleus increases the ability of muscle to produce large number of enzymes. These enzymes are proteins are important for the muscle contraction.

Thus, the correct answer is option (D).

6 0
3 years ago
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