An outbreak of a pathogen-caused illness occurs in a small neighborhood in a big city. Which of the following should investigators confirm first? The water supply is not contaminated.
The illness is not carried by insects.
The infected people's homes are clean.
The infected people are not genetically similar.

Consider this plant cell which organelle is labeled g

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.

Which describes the habitat of a frog?