What is the purpose of the cell cycle

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

During which phase does earth see more than half of the moon's surface? 1)first quarter2)third quarter3)waxing gibbous4)waning crescent