What is the superposition of strata theory? a. that rock strata has been laid down for 4.6 billion years

b. that sedimentary rick is composed of bits of rock eroded minerals

c. that oldest layers of sediment in rock formations are found under more recent layers

d. that the earth is composed of a core, mantle, and crust

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

What organs comprise the respiratory system of a bird

This connective tissue consists of large round densely packed cells with the nucleus pushed to one side.