Your friend is trying to figure out which flap configuration makes a paper airplane fly the farthest. Which of the following is the independent variable?

Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

Organelles are 1. responsible for producing power for the cell 2. tiny structures in the cell that carry out the cell's activities 3. responsible for digestion in the cell 4. found outside of the membrane