Osteoclast {Ans: type of bone cell that dissolves minerals in bone and releases them back into the blood}Testosterone {Ans: steroid hormone that is found in greater quantities in men than women and contributes to male sexual characteristics and development}Analogous Structure {Ans: body part that is similar in function as a body part of another organism but is structurally different}Spongy Bone {Ans: light, porous inner layer of bone that contains bone marrow}Adaptation {Ans: inherited trait that is selected for over time because it allows organisms to better survive in their environment}Plasma {Ans: clear yellowish fluid, about 90 percent water, that suspends cells in the blood}RNA Polymerase {Ans: Enzyme that catalyzes the synthesis of a complementary strand of RNA from a DNA template}vitamin {Ans: organic molecule that works with enzymes to regulate cell function, growth, and development}Negative Feedback {Ans: control system for homeostasis that adjusts the body's conditions when the conditions vary from the ideal}Heart {Ans: muscle in the chest that moves blood throughout the body}Zygote {Ans: cell that forms when a male gamete fertilizes a female gamete}Muscular System {Ans: human body system that includes all the muscles of the