I think that the answer would be C
Answer:
Secondary succession
Explanation:
When a previously occupied area is re-colonized after a natural disaster or human activities that wiped out the previous community, then the type of succession is called a secondary succession. A practical example is abandoned farmland that a farmer left for a period of time and later revisited for farming afterwards.
Because the pioneer organism( sun-loving plants ) were already on ground it will be fast for them to populate the area,grasses will sprout up too. insects, dentritivores, reptiles will move into the habitats.
After 5years;The habitat is populated by shrubs, which owns the forest floors. small pine, oak may soon join.a stable climax community.
Assuming the community is not interfere with bigger dominant trees , e,g the oak developed and other tree developed to bigger tree , followed by more insects, birds, rodents, herbivores and some carnivores, This entire sequence of event may take 50 years, to reach this climax community.
Answer:
Major histocompatibility complex (MHC) antigens
Explanation:
The process in which recipient body rejects the transplanted organ is called a allograft rejection or transplantation rejection.
A transplanted organ contains Major histocompatibility complex (MHC) antigens which are required to be accepted by the recipient's body to function properly but T cells in recipient's body become alloreactive and recognize MHC antigens (donor-derived antigens) as foreign and starts making antibodies against it. Which means the recipient's body is rejecting the transplanted organ.
Hence, the correct answer is "Major histocompatibility complex (MHC) antigens".
The third one and the last one.
