When looking for something on a slide you should start on the smallest magnification, that way you can see more of the slide. Once you have the object in focus, you can switch to a higher magnification.
About the question: You will find the graphs in the attached files
Answer:
Graph C is the one that represents the snail population after disruptive selection.
Explanation:
Due to technical problems, you will find the complete explanation in the attached files.
Answer: I think it's A
Explanation: im not too sure about this one.