One student made the incomplete diagram shown below to represent the relationship between magma, igneous rocks, and sedimentary rocks: three ovals, labeled from left to right, sedimentary rock, magma, and igneous rocks respectively.

Which of these is the correct next step to complete the diagram?

Put an arrow labeled heat and pressure, pointing from magma to igneous rocks.
Put an arrow labeled heat and melt, pointing from igneous rocks to magma.
Put an arrow labeled deposition and lithification, pointing from igneous rocks to magma.
Put an arrow labeled cools and crystallizes, pointing from igneous rocks to sedimentary rocks.

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed