10. A scientist announces that she has discovered a new species of tree frog in southeast Asia. When she publishes an article about this species, she presents a family tree showing where the
new frog fits with other species. She explains that she has concluded that it is a new species
based on DNA comparisons with existing species. Which tyne of snecies concent did she use?

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.