| A | B |
|---|
| cells | Basic unit of structure and function in all living things |
| respiration | process in which living things take in oxygen and use it to produce energy |
| ingestion | taking in food; eating |
| excretion | process of getting rid of waste materials |
| stimulus | a signal to which an organism reacts; a change in environment |
| consumer | an organism that must eat food in order to obtain nutrients and energy |
| digestion | process by which food is broken down into simpler substances |
| sexual | reproduction that requires two parents (occurs in most plants and animals) |
| asexual | reproduction that requires one parent (bacteria, yeast, some plants) |
| response | some action, movement, or change in behavior of the organism |
| producer | organisms that make their own food (green plants) |
| life span | the maximum length of time an organism can be expected to live |
| spontaneous generation | hypothesis that states that life can begin from nonliving matter |
| metabolism | the sum total of all the chemical reactions that occur in a living thing |
| unicellular | single-celled organisms |
| multi-cellular | organisms that consist of many cells |
| homeostasis | the ability of an organism to maintain a proper body temperatuire |
| cold-blooded | organisms, such as reptiles, whose body temperature changes (varies) with the surrounding environmental conditions |
| Six basic needs | oxygen, food, shelter, energy, homeostasis, water |
| Seven limiting factors | predation, food, disease, reproduction, habitat, water, competition |
