Answer:
Primary Succession
Explanation:
Because no organisms previously lived on it. Parking lots can be considered
like rocks, which also undergo primary succession. Overtime soil
will be blown onto the parking lot and if not maintained plants
will begin to grow thus starting new life.
B cells produce antigen
t cell are helper,killer,memory cells
they hold memory of pathogens i the system
When liquid water is exposed to 32 Fahrenheit, it get freeze. It is because it is freezing point of water
By looking for the presence of the germ layers and the primitive gut in the embryo
