Help please and ill like

Answer this question, only if you know the answer. 30 points and brainliest!

The graph of a curve that passes the vertical line test is a:

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is