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Lyrx [107]
3 years ago
15

78% of Earth's atmosphere is nitrogen gas. All living things need nitrogen as a part of DNA and RNA. Yet you and I, and other li

ving things, cannot use the nitrogen in our atmosphere directly. One type of organism is responsible for "fixing" nitrogen or helping to put it in a form so other living things can use it. That organism is?
A) bacteria.
B) fungi.
C) plants.
D) viruses.
Biology
2 answers:
Natalija [7]3 years ago
4 0

The answer is A. Bacteria

Bas_tet [7]3 years ago
3 0
Correct Answer:
Option A

Explanation:
Nitrogen fixation means converting the atmospheric nitrogen to Ammonia or to other compounds which can be readily used by other organisms. As stated in the question, the nitrogen available in the atmosphere is inert, so it must be converted into a form so that the organisms can use it. The bacteria responsible for this activity are known as Nitrogen Fixing Bacteria and are an important element of the ecosystem. Some of these Nitrogen fixing bacteria live freely in the soil while some are associated with the crops. Some examples of Nitrogen fixing bacteria are Rhizobium and Azospirillum.
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The answer should be C, progesterone.


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On the other hand, LH, luteinising hormone, is produced by oestrogen, another female hormone which will drop after ovulation. LH helps stimulate ovulation and prevent the development of other follicles, the origin of eggs, to form yellow body instead. Which yellow body is the one which stimulates the production of progesterone.


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Explanation:

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