Asap. i also need explanations to go with the answer

Ground squirrels receive energy captured by the producers.

Explanation:

Producers are placed in the first tropic level of an energy pyramid of an ecosystem.The green plants act as producers because they can generate their own food by the process called photosynthesis.

   According to the diagram given in the question the ground squirrels are the organisms which receives energy captured by the producers.As a result ground squirrels act as primary consumers and they are placed in the second tropic level  of the energy pyramid.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

answer: all : )

explanation: