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Vadim26 [7]
3 years ago
9

The two nutrients that typically limit primary productivity of ecosystems are phosphorus and __________. A. calcium B. carbon C.

nitrogen D. sodium
Biology
1 answer:
Mrrafil [7]3 years ago
5 0
The answer is C. nitrogen.

Plants are main producers in ecosystems so, primary productivity of ecosystems depends on them. Carbon is necessary for plants, but it is widely present in plants. On the other hand, calcium and sodium are not as essential. However, nitrogen is important for plants because it is necessary to make proteins. Proteins take part in many different processes such as photosynthesis (this is actually primary productivity). But, nitrogen is not available to plants, they cannot absorb it simply from the air but rely on some symbiotic bacteria which are able to.
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Answer:

disruptive selection

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Disruptive selection may be defined as a type of a natural selection which selects against some average individual in a given population. These makeup of such a type of the population shows the phenotypes of both the extremes of characteristics but they have very few individuals in the middle.

Disruptive selection is also known as diversifying selection.

In the given context, the beaks of an African seedcracker finches may be small or may be large but they are not of the intermediate size. Such a selection is known as disruptive selection in species.

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2. Ms. L's respiratory function was evaluated by quantifying different lung volumes and capaci-
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Based on respiratory function tests, the correct options are:

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<h3>What is a respiratory function tests?</h3>

A respiratory function test is a test done to evaluate the ability of the lungs to take in air and remove carbon dioxide

The machine used for this test is called a spirometer.

Therefore;

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Learn more about respiratory function test at: brainly.com/question/18117969

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