Plant cells have a large membrane-bound space in which water, waste products, and nutrients can be stored. This space is called the

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Enzymes are proteins that speed up reactions by providing an additional energy source supplying additional molecules for the reaction removing inhibitors that slow down reactions lowering the amount of energy required

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings