A student takes granite, a sample of igneous rock, and masses it. She records the initial mass. She then places the rock into a rock tumbler, which mechanically tumbles the rock on a continuous cycle. After two weeks, the student removes the rock from the tumbler
and takes its final mass. She makes observations that the rock seems smoother and has lost 8% of its mass over time.
Select the independent variable in this experiment and the step of the rock cycle the student is most likely modeling.

*will mark brainliest to the first and correct answer less species diversity results in less a. oxygen b. food c. drinkable water d. all of the above

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates