1. Classify insulin as being one of the following
Steroid
- Fatty acid
Protein
Carbohydrate

Protein

Explanation: Insulin is a protein and a peptide hormone with two polypeptide chains joined by two disulfide bonds. Insulin is synthesized in the pancreas as an inactive single-chain precursor, preproinsulin with an amino-terminal signal sequence. Proteolytic removal of the signal sequence and formation of three disulfide bonds produces provision, which is stored in secretory granules in pancreatic cells. Insulin secretion is triggers by high blood glucose level. When elevated blood glucose triggers Insulin secretion, proinsulin is converted into active by specific proteases that cleave two peptide bonds to form the mature insulin molecule. Insulin stimulates glucose uptake by muscle tissue and activates glycogen synthase that catalyzes the synthesis of glycogen and inactivates glycogen phosphoryl which catalyzes the breakdown of glycogen, thereby converting the excess blood glucose to glycogen for storage.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.