The most successful reinforcement schedule to use after an animal has learned a new trick has been shown to be:
a)fixed-ratio
b) fixed interval
c) variable ratio
d) variable-interva

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 of the following is the sl unit used to measure temperature a. kilogram b. liter c. meter d. kelvin

Introducing minvasive species to an ecosystem results in an increase in biodiversity is it true or false