Which type of bond holds atoms together in a water molecule

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.

3differences between bacteria and other 2 cells

What type of cell division is used to replace old cell?