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Taya2010 [7]
2 years ago
15

Life on earth began as the product of chemical reactions which occurred

Biology
1 answer:
Kazeer [188]2 years ago
7 0

Answer: Over 4 billion years ago

Explanation: The chemical reactions between carbon and water is said to bring about life according to scientists. These reactions builds largely upon four families of chemicals (lipids, carbohydrates, amino acids, and nucleic acids).

However, the actual time of life on Earth has varying speculations from different scientists in fields of study (such as molecular biology, chemistry, oceanography, etc).

Furthermore, microfossils within hydrothermal-vent precipitates dated from 3.77 to 4.28 billion years is presumed to inhabit the oldest record of life on Earth. Hence, which is presumed to have occurred after ocean formation 4.4billion years ago.

Thus, the actual date of the chemical reactions that brought about life is not rigid, but presumed to have occurred over 4billion years ago (according to research).

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Murljashka [212]
Answer: It produces male and female sex cells


a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.
8 0
3 years ago
1. Digital signals carry less information per second.
DENIUS [597]

Answer:

2. Information can be stored for future recovery.

3. Digital signals can be transmitted over long distances.

Explanation:

This world is moving towards digitalization. The digital signals are able to transmit the data over long distance. This has squeezed the world information and the data are run to distant places within seconds. The information on digital signals can be stored for later use.

5 0
3 years ago
Which of the following does NOT involve a type of genetic modification?
KengaRu [80]

Answer:

the answer would be B the production of human insulin

3 0
3 years ago
Your project should include discussions of the following: the structures and functions of the circulatory system factors that af
just olya [345]

Answer:

Circulatory system remove waste from the cell and provide clean blood to the cell.

Explanation:

During cellular respiration, lungs inhale oxygen which stored in the alveoli. The red blood cells contains hemoglobin that carries deoxygenated blood containing carbondioxide from the cell in the veins to the heart and unload this carbondioxide gas in the alveoli of the lungs and load oxygenated blood having oxygen from the alveoli through capillaries in order to provide oxygen to the cells that is necessary for the survival of humans. Platelets are the type of cells that helps in blood clotting whereas white blood cells provides immunity against pathogens.

3 0
3 years ago
The cilia and mucus in the trachea sweep upward, moving the mucus toward the nose where it is sneezed out. ________
Mumz [18]
Hello there :)

I am quite sure this is a true/false question

This statement is false.
Yes, the cilia and mucus in the trachea does sweep upward, however, it moves the mucus towards the pharynx where it is swallowed not towards the nose where it is sneezed out.
5 0
3 years ago
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