Lions are classified as Panthera leo. Tigers are classified as Panthera tigris. Which of the following statements is true? Lions and tigers belong to the same genus. Leo is the name of the lion division. Lions and tigers belong to the same species. Panthera is the name of an order.

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.

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.

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