Many fungal species release huge amounts of sexual spores that are carried far and wide by the wind. these sexual spores need to encounter spores with a different mating type locus from the same species in order to start a new fungal colony. what mechanism is most likely prohibiting the formation of hybrid fungal colonies?

format change of dna.  

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

i'd say that the moon rock is about 2.2 billion years old.