Use the drop-down menus to complete the sentences about air pollution.
The burning of
causes dangerous gases to enter the atmosphere.
Heavy, dense fog caused by dangerous gases mixing in the atmosphere is called
occurs when dangerous gases mix in the atmosphere and fall back to the surface in liquid form.

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

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.

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?