Answer is A
Firstly axon must reach the threshold level and then depolarisation occurs. Depolarisation phrase means sodium enters and potassium leaves the axon . Choice C can't be because main idea is the entering of sodium ions.
Mutualism is when two organisms are involved and they both benefit where as parasites is when two organisms are involved, but one is benefitted while the other is harmed.
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Answer: Small countries, such as Bangladesh, are practicing subsistence fishing, taking only the fish needed to survive.
Explanation:
Answer:
This is the answer to ur question
1. Phosphate
2. Pentose sugar
3. Nitrogenous Base