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tatyana61 [14]
4 years ago
7

Which molecule does atmospheric oxygen initially come from?

Biology
1 answer:
Olin [163]4 years ago
8 0

Answer:

The atmospheric oxygen initially came from the water molecule

Explanation:

Condition on the primitive Earth , about 4 billion year ago were such which favored chemical evolution. . When the temperature of the Earth was less than 100 degree Celsius. Its atmosphere had nitrogen in the form of ammonia, carbon in the form of carbon dioxide and oxygen in the form of water vapour. There was no free oxygen available and so the atmosphere was reducing.

Then spontaneously biomolecules originated which further gave rise to protobionts. These protobionts evolved into several unicellular organisms among which one was cyanobacteria.

Cyanobacteria are considered as the organisms which added the first molecule of free atmospheric oxygen into the atmosphere. They carried out photosynthesis and split the water molecules to release oxygen as the bye product of the process.

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Firlakuza [10]
<span>*The RNA directed synthesis of a protein. RNA makes protein-----TRANSLATION
*Nitrogenous base found only in DNA ------ THYMINE
*The DNA directed synthesis of RNA. DNA makes RNA--------TRANSCRIPTION
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*Carries DNA's message from DNA to ribosomes.------- mRNA
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5 0
4 years ago
Which adds evidence to the idea that the cell is the basic unit of life
Natalka [10]

Explanation:

<em>Complete question:</em>

<em>A. Cells contain ribosomes and have a cell membrane. </em>

<em>B. It is impossible for a multicellular organism to survive. </em>

<em>C. Many organisms in the world are made of only one cell. </em>

<em>D. Small organisms are generated spontaneously. </em>

<u />

<u>Correct: C. Many organisms in the world are made of only one cell. </u>

<u />

Biology's unifying principle states that cells are the basic units of biological organisms. Cells sharing a similar origin, group together inmulticellular organismsto form tissues; these typically share physical features and are arranged in regular patterns. All living things, grow, respire, reproduce etc. these processes are carried out by cells, which are thus integral to their survival.

Further Explanation:

Before the discovery of cells by Robert Hooke in 1665 with a simple microscope, many scientists had long believed that life of rose spontaneously over extended periods of time. Circa 1668 Francesco Redi, challenged the idea of spontaneous generation of maggots from rotting meat by placing meat in various sealed open, partially sealed and sealed containers

. Sealed containers did not show the presence of maggots, and he theorized that these were likely from eggs laid on the meat by flies. This was the development of the theory of abiogenesis (cells arise from other living cells); this eventually proved the unifying principle we know today.

Learn more about cellular life at brainly.com/question/11259903

Learn more about tissue types at brainly.com/question/8487952

#LearnWithBrainly

8 0
3 years ago
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Romashka [77]
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3 0
4 years ago
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I’ll get you the answer rn queen brb
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Which term identifies proteins that allow muscles to shorten it lengthen
Tresset [83]
The answer would be contractile. Hope this helps you
4 0
3 years ago
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