How is carbon reintroduced into the atmosphere?
a. respiration
b. photosynthesis
c. evaporation
d. all of the above

The correct answer would be a. respiration.

In the atmosphere, carbon is present in the form of carbon dioxide. It forms the major components of organic substances or molecules. It is majorly fixed in the ecosystem by process of photosynthesis.

The number of processes or activities help to reintroduce carbon into the atmosphere. Some of them are:

Respiration: Most of the living organisms release carbon dioxide in the atmosphere through respiration. They harnessed energy from food and release carbon dioxide as the byproduct of the process.

The burning of fossil fuels also releases a huge amount of carbon dioxide in the atmosphere.

Volcanic irruptions, forests fires et cetera also release carbon dioxide in the atmosphere.

Hence, we can say that respiration helps in reintroducing carbon into the atmosphere.

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explanation:

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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