Which factors may contribute to the extinction of a species? Check all that apply.
-more individuals fighting over the same resources
-fewer individuals fighting over the same resources
-the loss of the environment in which an organism's needs are met
-the gain of an environment in which an organism's needs are met
-the lack of predators in an area
-the introduction of new predators into an area

FIRST,THIRD,SIXTH

Explanation:

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*More individuals fighting over the same resources

*The loss of the environment in which an organism's needs are met

*The lack of predators in an area.

Explanation:

Extinction of specie reffers to the termination of a kind of specie of organism or of a group of kinds of specie of organism.The death of the last individual of a particular species is taken as the moment of extinction.

New varieties of organisms usually develop and thrive through evolution,when there is exploitation of ecological niche by that variety of the specie of the organism,

though they usually become extinct when they are no longer able to survive as a result of change in environmental conditions or when against superior competition.Extinction could be in Mass or in isolation, but the common one is isolation extinction.

Some of the factors that may contribute to the extinction of species are;

a)When there is more individuals fighting over the same resources

b)When there is loss of the environment in which an organism's needs are met.

c)The lack of predators in an area.

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.