Answer:
A.is the process of breeding only organisms with desirable traits
Answer: C). nitrogen fixation
The atmospheric nitrogen is converted into nitrogen compounds by nitrogen -fixing bacteria present in the soil. Plants absorb nitrogen compounds like nitrates and nitrites and water from soil. These nitrogen compounds are converted into ammonia which is necessary for protein synthesis in plants. This process of conversion of atmospheric nitrogen into ammonia by plants is known as nitrogen fixation.
The correct statements are Ecosystems can be small Ecosystems can be large Ecosystems have nonliving parts An ecosystem consists of the interaction of living and nonliving parts. The size of an ecosystem is not a factor, as they may span large areas or may even be contained in a small pond.