1. is this statement true or false?

living things are classified by the characteristics they have in common.

2. there are seven major levels of classification. kingdom and phylum are just two of the levels.
which choices are also major levels of classification?

choose all answers that are correct.
class
order
family
level

3. which choices are also major levels of classification?
choose all answers that are correct
genus
species
group

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.

Give an example of a trait that is controlled by more than one gene.

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are