Biology

The correct answer is: D.a phosphate group is removed.

Energy is released from ATP when one of its phosphate groups is removed through a process called hydrolysis. Specifically, when ATP (Adenosine Triphosphate) loses one of its three phosphate groups, it becomes ADP (Adenosine Diphosphate), and energy is released in the process. This energy is used by cells for various functions, such as muscle contraction, protein synthesis, and active transport across membranes.

Here's why the other options are incorrect:

A.A phosphate group is adde...