D. because the sun grows the grass the mouse eats the grass and the snake eats the mouse...
Answer:
Gas exchange occurs at the alveoli in the lungs and takes place by diffusion. The alveoli are surrounded by capillaries so oxygen and carbon dioxide diffuse between the air in the alveoli and the blood in the capillaries
Explanation:
It takes place <span>between the alveoli and capillaries, which are located in the walls of the alveoli.</span>
Answer: The steps may not always be completed in the same order. Following the four steps, the results of the experiment will either support the hypothesis or will not support the hypothesis. Scientists are always free to change or write a new hypothesis and start the four steps all over again.
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