One green leafy vegetables is

Explanation:

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Spinach is a leafy, green vegetable. It is one of the most nutritious foods on earth. Here is detailed health and nutrition information about spinach. Broccoli is a popular vegetable that is high in many nutrients, including fiber and vitamin C.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

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