I believe the snake is the secondary consumer, the mouse is the primary consumer as it eats plants before it, the snake then eats the mouse which makes it the secondary consumer, and the eagle eats the snake which makes it the tertiary consumer.
answer=snake
hope this helped!
Answer from: Quest
Im assuming this is a multiple choice answer what is the answers to chooce from?
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.