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.
Fragmentation is the breaking of the body into parts and then the organism develops all the parts of the body. The fragmentation is the type of reproduction in lower organisms. The fragments which are produced can develop into new organisms.
Pretty sure the answer is oxygen, as it is produced in photosynthesis and consumed in respiration.
The flowering part in Monocot plants are in multiples of threes is a true statement. There can be either three or in multiples of three <span>flowering parts. </span>
