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henryzx900
05.11.2019 •
Biology
The two nutrients that typically limit primary productivity of ecosystems are phosphorus and a. calcium b. carbon c. nitrogen d. sodium
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Ответ:
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.
Ответ:
alternatively it can be said that they were all created by the some entity