. Rosemary Grant, the scientist said,["Beaks are tools, and you need

the answer to your question is:

c. complementary base-pairing

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds