Scientist have establish that some of the layers of earth are solid summer liquid in summer semifluid explain how scientists are able to determine the liquid and solid layers is at least two pieces of evidence to support your answer?

Geology involves integration of various different sciences (chemistry, physics, and biology for example), but also requires an understanding of the importance of billions of years of geological time.

Paleontology is an important aspect of geology and requires an understanding of biology, including evolution, the physiology of animals and plants and ecological relationships.

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation:

substitution is the answer in this case