Which of the following describe density-dependent factors? They act to regulate population growth. They can affect birth rates or death rates. One example would be intraspecific competition for resources. They are especially important in K-selected populations. They do not involve biological interactions. They can affect growth rates but not population size.

Correct options are

a) They act to regulate population growth.

b) They can affect birth rates or death rates

c) One example would be intraspecific competition for resources.

Explanation:

Population growth rates can be regulated by the density of a population and hence population regulation is a density-dependent process.  Density-dependent factors include disease, competition, and predation.  

The higher the population density, the higher is the mortality rate.  

Some of the biotic density dependent factors are  

a)intra- and interspecific competition

b)reducing population’s rate of growth

c)Individual’s reproductive rate

Hence, the correct options are

So the correct options are

a) They act to regulate population growth.

b) They can affect birth rates or death rates

c) One example would be intraspecific competition for resources.

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.

the answer would be d : p