How do nerve cells form different types of tissues? a. a group of these cells perform similar functions and become nerve tissue after messages from the brain tell nerve cells how to develop and perform special functions. b. a group of these tissues perform similar functions and become nerve organs after messages from the heart tell nerve cells to develop and perform special functions. c. a group of these cells perform similar functions and become nerve tissue after information in the dna of the nucleus tells the nerve cells to develop and perform special functions.

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

1. which of the following is correct regarding opiates/opioids: a. they all have a natural component as a starting pointb. they have low addiction possibilitiesc. methadone binds to some of the same receptorsd. a and care correcte. all are correct

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.