Nthe human respiratory system, oxygen enters the body through the nose and mouth, travels down through the lungs, and is transferred into the bloodstream (circulatory system) through tiny gas sacs called a) alveoli b) bronchi c) arteries d) ventricles

What did hunter gathers do to alter the environment?

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Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water