Pull down on the during each contraction to close the av valves. in av valve prolapse, these muscles become detached, and both valves and blood fly up into the atrium during systole.

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim

Which of the following happened during the precambrian era? the first prokaryotic cells the first eukaryotic cells development of photosynthesis all of the above

Which describes the habitat of a frog?