Answer:
Nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). More than 90 percent of all nitrogen fixation is effected by these organisms, which thus play an important role in the nitrogen cycle.
Explanation:
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C4 plants are those plants that cycle carbon dioxide into four carbon sugar compound which enter into the Calvin cycle. C4 Plants keep their stomata closed on hot days IN ORDER TO ELIMINATE WATER LOSS.
C4 plants are very efficient in hot and dry climates and they make a lot of energy.
Energy flows through an ecosystem.
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Answer:
1- Brain, spinal cord and heart begins to form.
2-Genitals begin to develop.
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The answer would be D. They reproduce sexually and have many traits that are easy to observe.