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Maintaining a healthy weight allows the respiratory system to work more effectively because a. oxygen is being delivered more adequately. b. the heart does not have to pump as forcefully. c. the capillaries are constricted. d. the lung capacity allows for small amounts of air.

Ascientist finds an organism that cannot move it has many cells produces spores and gets food from its environment in which kingdom does it belong explains

What is an important step to prove something is valid or not? determining the reliability observing research testing