Which of these phrases could be placed into position marked with an X

An ecologist is studying the effects that a population of predators is having on a population of a prey. he used data from the field to produce this graph. which conclusion can draw from the graph?

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

You see a white marker with an orange circle and black lettering. what does this marker tell you