What are marks left in rocks of once-living organisms called?

Answers

Answer 1
Answer: Fossils!!!!!!!!!!!!!!!!!!!!!!!!! ^-^
Answer 2
Answer: The answer is fossils

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What are similarities and differences between compound light microscopes and electron microscopes?

Answers

The similarities between compound light microscopes and electron microscopes are as follows:

  • Both types of microscopes utilize radiation to construct a larger and more detailed image of objects.
  • Both types of instruments are used for the visualization of small objects like biological specimens, crystal structures, etc.

What is an Electron microscope?

An electron microscope may be defined as a technical instrument that is significantly utilized in order to obtain a high-resolution image of biological and non-biological specimens with the help of a beam of accelerated electrons.

The differences between compound light microscopes and electron microscopes are as follows:

  • A Light microscope uses light radiation to form an enlarged image, while an electron microscope uses a beam of accelerated electrons for the same.
  • An Electron microscope uses a much shorter wavelength as compared to visible light and thus forms a high-resolution image than that of a light microscope.

Therefore, the similarities and differences between light and electron microscopes are distinctly explained.

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Similarities: Both are able to see small objects. 


Differences: Electron micro can see more closer than a light. 

In the heart, the mixing of oxygen-rich and oxygen-poor blood is prevented by the . • septum. .
• pericardium. .

Answers

In the heart, the mixing of oxygen-rich and oxygen-poor blood is prevented by the muscular wall known as Septum.

What is the function of the heart?

The function of the heart is understood by the fact that it efficiently pumps blood throughout the body. This pumping of blood to the entire body delivers the supply of oxygen, hormones, and various other nutrients to each and every cell of the body for its metabolic processes.

The right and left sides of the heart are separated by a muscular wall which is known as a septum. It prevents blood without oxygen from mixing with the blood that has oxygen. The heart also has valves that separate the chambers and connect to major blood vessels.

Therefore, in the heart, the mixing of oxygen-rich and oxygen-poor blood is prevented by the muscular wall known as Septum.

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A low secretion of luteinizing hormone (LH) in the normal male adult would cause A. shrinkage of the anterior pituitary gland
B. decreased testosterone secretion
C. excessive beard growth
D. increased spermatogenesis

Answers

Answer:

A low secretion of luteinizing hormone(LH) in the normal male adult would cause B. decreased testosterone secretion.

Explanation:

For males the normal range is  1.24 -7.8 IU/L. If LH levels are below the normal range it may indicate a pituitary gland problem. Their pituitary gland may not be making enough LH which may lead to low testosterone.

Hypogonadism is a testicular disorder associated with low testosterone. Low testosterone levels can cause a variety of problems including diminished muscle mass & decreased sex drive as well as decrease in the physical as well as mental energy.

Final answer:

Luteinizing Hormone (LH) in males stimulates the production of testosterone. If LH secretion is low, it would result in decreased secretion of testosterone.

Explanation:

The secretion of Luteinizing Hormone (LH) plays a significant role in the male reproductive system. A low secretion of LH in a normal adult male most likely impacts the production of testosterone because LH stimulates the testes to produce this hormone. Therefore, a decrease in LH secretion would logically lead to a decreased secretion of testosterone (Option B). This decrease in testosterone can further lead to a reduction in sex drive, decreased muscle mass, and other sexual and physical changes.

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How does the greenhouse effect work?

Answers

Gases in the atmosphere such as carbon dioxide do what the roof of a green house does. During the day the sunshines through the atmosphere. Earths surface warms up in the sunlight. At night, Earths surface cools, releasing the heat back into the air.

 
The greenhouse effect is when radiation from a planet's atmosphere warms the planet's surface to a temperature higher than what it would be without its atmosphere. If a planet's atmosphere has radiatively active gases the atmosphere will radiate energy everywhere

What stage of cellular respiration requires the input of energy

Answers

Answer:

Glycolysis

Explanation:

The endosymbiotic theory suggests that a prokaryotic cell ate another prokaryote, giving rise to eukaryotes..true or false

Answers

The answer is trueLol XD