Select all that apply.
enzymes
are not required to sustain the life of an organism
act as catalysts in chemical reactions of cells
interact with specific substrates like a lock and key
can lower the required activation energy for reactions in living organisms

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.