Answer:
e. equal numbers of protons and neutrons in the nucleus orbited by varying numbers of electrons
Explanation:
Answer: salivary glands
Explanation: i just remember from 4th grade health class
Answer:
Dissolved oxygen concentrations are constantly affected by diffusion and aeration, photosynthesis, respiration and decomposition. While water equilibrates toward 100% air saturation, dissolved oxygen levels will also fluctuate with temperature, salinity and pressure changes ³.
Explanation: