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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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2 years ago
What is food energy in the form of glucose?
tiny-mole [99]
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3 years ago
Describe the neural and renal mechanisms that control blood pressure.
Andrei [34K]

Answer:

The autonomic nervous system is the main neural regulator of circulation and blood pressure in the short term and beat by beat and exerts its function through various reflexes that regulate vasomotor tone, heart rate and cardiac output. At the renal level, the renin–angiotensin–aldosterone system is possibly the most important in the maintenance of arterial homeostasis.

Explanation:

Blood pressure is regulated by a series of interrelated autonomic systems and humoral reflexes, which continually adjust the determining elements of the system (heart rate, stroke volume, total peripheral resistance and circulating volume).The effective circulating volume is controlled by a series of reflex systems, which obtain information about the perfusion pressure (baroreceptors in the carotid bulb and aortic arch), plasma osmolarity (hypothalamus) and urinary sodium (distal tubule).The kidney has its own self-regulatory mechanisms. The reduction in renal blood flow is detected at the level of the mesangial cells of the juxtaglomerular apparatus, starting the renin-angiotensin system. The increase in angiotensin II produces on the one hand local vasoconstriction, and on the other hand stimulates the production of aldosterone by the adrenal cortex with the consequent tubular reabsorption of sodium and water.Antidiuretic hormone or vasopressin (released from the hypothalamus by stimulation of arterial baroreceptors and also by stimulation of angiotensin II) also acts at the renal level, which acts as a powerful and water-saving vasoconstrictor in the distal tubule.

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Answer:

Nerve cells, blood cells, and reproductive cells

Explanation:

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