There were 20 brown bears in an area of a small Canadian forest during the summer months. Scientists expected a change in population size coming soon. What factors would cause an increase in the brown bear population size?a. An increase in soil nutrients and decrease in summer temperaturesb. An increase in competition and decrease in birthsc. An increase in births and emigrationd. An increase in food sources and immigration

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?