A group of students run a simulation of resource consumption in which cereal is used to model a resource. The students use tweezers to pick up pieces of cereal one at a time and place them in a cup. The group runs the simulation two times, keeping all factors the same except the number of students allowed to collect the cereal at the same time. What variable are the students most likely testing?

A. Conservation method
B. Use of technology
C. Evenness of distribution
D. Population size

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?