Question

The process by which organisms keep everything inside their bodies within certain limits is called (1 point)
homeostasis.
evolution.
metabolism.
photosynthesis.
3. During a controlled experiment, a scientist isolates and tests (1 point)
a conclusion.
a mass of information.
a control group.
a single variable.
4. Which of the following represents an ion? (1 point)
a particle having 14 protons, 14 neutrons, and 14 electrons
a particle having 9 protons, 9 neutrons, and 10 electrons
a particle having 19 protons, 21 neutrons, and 19 electrons