Fill in the blank a species was added into a particular ecosystem to control the population of a prey species. this method of introducing a new species is called ( choices a. biological augmentation b. bioremediation reforestation) the population of the added species increased, leading to an imbalance in the ecosystem. this increase happened because (blank) (a. the competition for resources increased in the ecosystem b. the population of prey species increased in the ecosystem c. the amount of resources increased in the ecosystem (two anwsers )

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.

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.

When making her coffee, mrs. jenkins likes to stir in some cream and sugar to give it a pleasant flavor. the ingredients, when combined like this, form a