Ascientist conducted an experiment to determine if temperature affects the length of a butterfly's life cycle. she collected several eggs that were laid at the same time by one butterfly, and divided them into three aquariums. each aquarium contained enough food and water for all of their lifetimes. the containers were kept at 60º f, 70º f, and 80º f. what is the tested or manipulated variable? a. the temperature of each aquarium b. the number of days it took for adult butterflies to appear in each aquarium c. the number of eggs that hatched in each aquarium d. the total number of days in each butterfly's life cycle

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

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.

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f