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An acid rain is a type of rain or precipitation that has a high level of hydrogen ions resulting in low pH. It can prevent growth of seedlings because it hinders the cell division of plants. Since animals consume plants, they can establish new dietary habits or migrate to areas that have a healthier environment.
Answer:
Pasteur observed that the broth in the straight-neck flask was discolored and cloudy, while the broth in the curved-neck flask had not changed.
Explanation:
He concluded that germs in the air were able to fall unobstructed down the straight-necked flask and contaminate the broth. The other flask, however, trapped germs in its curved neck, preventing them from reaching the broth, which never changed color or became cloudy.
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Grass (producer) -> Cricket (primary consumer) -> Mouse (secondary consumer) -> Snake (Tertiary consumer) -> Hawk (Quaternary consumer)