How many kingdoms are there in the most current tree of life?

Which is an example of a population?

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.

All other things being equal the size of a population will decrease if