Which of the following would most severely affect a human population? (1 point)

a high number of smokers in a community

a high degree of genetic similarity among people

a high degree of illegal drug use among young adults

a high rate of mental disorders

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

What are some possible consequences of preventing prescribed burns and natural wildfires

This is the nitrogenous base only found in rna