Why is a starfish a keystone species?

Yes

Explanation:

they are considered a keystone epecies because they feast on other species that really have no other predators making them very important to their ecosystem.

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products