Answer:
Homeostasis is the process of maintaining a constant internal environment suitable sustaining life.
Hm maybe put the definition of each choice? AHH sorry
Comparative and experimental investigations are two of three scientific investigations, the other is descriptive investigations.
--hope this helps--
Answer:
CH4 has one carbon atom and 4 hydrogens, making a total of 5. MgO has 1 magnesium atom and 1 oxygen atom, making for a total of 2.