Which phrase best describes the nucleus? a. The site of lipid and steroid production b. The site of protein production c. The organelle that produces ATP d. The organelle that houses DNA

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

Photosynthesis converts solar energy into what type of energy?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion