Pharyngeal slits represent another fantastic case for the theory of evolution, as we can trace the lineage from embryonic development to final structure in the adult. For sharks, the embryonic pharyngeal slits transition into jaw bones and gill arches. In humans the embryonic pharyngeal slits transition into what?

What is a codon and where is it found

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 mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis