What is true of enzymes? they only slow down reactions. they act as catalysts, each for one specific reaction. they only speed up reactions. they speed up or slow down any reaction in a living thing.

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

What substance acts to prevent sudden ph changes in bodily fluids?