Magine that, of three species, it is known that species 1 and 3 were separated 10 million years ago, based on geologic measurements. genetic analysis at a neutral locus indicates that these species differ by 100 substitutions. if there are 10 substitutions separating species 1 and 2, approximately how long ago did these species diverge?

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

What is the number of phosphates in an atp molecule

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.