Action potentials received directly from stimulate the papillary muscles to contract allowing for the proper of the av valves.

What causes an unsaturated fatty acid to have a different shape than a saturated fatty acid? o a. unsaturated fatty acids have more hydrogen atoms. o b. unsaturated fatty acids have double carbon bonds. o c. unsaturated fatty acids have more nitrogen atoms. o d. unsaturated fatty acids have single carbon bonds.

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays