Which of the following is a unicellular organism?

a turtle

a flea

a cat

a bacteria

What is the broadest level of classification of life

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?

Of your good in bio kusing a series of preliminary observations; pstate a problem developed from these observations, formulate a hypothesis, design an experiment to test the hypothesis