O A building block of the nucleus
O A single "letter" of DNA
An entire strand of DNA
Answer:
A single letter of DNA.
Explanation:
Answer: The correct answer is-
phytoplankton .
In the given food chain of aquatic ecosystem, Phytoplanktons occupy the first trophic level ( as they form the base of the food chain) and they are called producers ( synthesize their own food using carbon dioxide and water in the presence of sunlight).
The energy is then transferred to the subsequent trophic levels from phytoplanktons to consumers ( krill, seals, and sharks).
If phytoplanktons are removed from the food chain, there will be no food available for krill and they will start to decline, which will eventually cause the decline in the subsequent trophic levels ( that is seals and shark).
Thus, phytoplanktons is the right answer.
Answer:
i think its limestone
Explanation:
oxygen
family
all of the above