Scientific method is one of then I'm pretty sure because that's a way of studying the world around you in a series of steps
Answer:
<em>Botany is the scientific study of plants—how plants function, what they look like, how they are related to each other, where they grow, how people make use of plants, and how plants evolved.</em>
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The answer is d. Water Cycle.
It is bad to litter because that is harming the environment. When you throw out a can, it can harm a animal or several animals. Litter can also sink into the ground (I think) and harm the plants growing.