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joe sowed seeds of a plant in two different types of soil in separate pots. she added the same amount of fertilizer to the pots. she then placed the pots in the sun and recorded their growth after four days. what is the independent variable in the study?

duration of growth

amount of fertilizer

growth of seeds

type of soil

Amount of Fertilizer

The answer you are looking for is Amount of Fertilizer. Hope this helped and have a great day. :D

Explanation:

the answer is a

photosynthesis

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.