The answer is cell. cell is the basic unit of humans
...an area where a ecological succession has already happened.
A secondary succession would occur where an area has been burned down or has experienced an event that has destroyed the prior ecosystem completely.
"Pituitary Gland" secretes the Growth hormone.
[ Remember it is a Gland not an organ,]
Hope this helps!
The first statement is correct. This is because plants transfer light (which is absorbed by chlorophyll) to chemical energy to convert carbon dioxide and water into glucose and oxygen.
