Fill in the Blanks living things reviewOnline version review by erika garfias 1 classification kingdoms microscope eliminated energy organism change reproduction grow amoeba Nutrients are chemicals that all living things must have to stay alive . An is a kind of life . An is a one - celled creature that can only be seen under a . all living things get from the nutrients they consume . The categories scientists use to classify organisms are called . New creatures are created through the process of . All living things must and . Wastes are poisonous and must be . Its called when scientist put living creatures into kingdoms .