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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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A pharmacist has two vitamin-supplement powders. The first powder is 10% vitamin B1 and 30% vitamin B2. The second is 15% vitami
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Answer:

560 mg of powder 1 and 160 mg of powder 2

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Let "X" denotes weight of powder 1 added to the new mixture and  "Y" denotes weight of powder 2 added to the new mixture

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