Human blood glucose (the amount of glucose in the blood) is sensed by chemoreceptors on the pancreas. When blood glucose is too low , the pancreas secretes the hormone glucagon. When glucagon binds to liver cells, it causes them to break glycogen down into glucose and release that glucose into the blood stream. What will happen when the chemoreceptors on the pancreas sense that blood glucose levels are almost back up to normal (set point) again?

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.