Instructor's manual to accompany Purves, Orians and Heller Life: the science of biology, fourth edition /
Meehan, Roberta M.
Purves, William K.(William Kirkwood),1934-Life: the science of biology. 4th ed.
Orians, Gordon H.
Heller, H. Craig.
Sunderland, Ma. : Sinauer Associates,
c1995.