C. Having too many natural resources
Answer: A) affects genotypic expression of characters.
Explanation:
Environmental variations cause several affects on the genotypic expression of characters. Genotype is defined as the genetic that prepare in the individual so that it has production of protein which after that involving with the environmental components result in the physical characteristic named as phenotype. Therefore, environmental variation cause more affect on the genotypic expression more than itself.
Answer: option D) glucagon and insulin
Explanation:
The hormones glucagon and insulin are secreted by the islets cells found in the pancreas. Specifically, alpha cells of the islet produce glucagon, while its beta cells produce insulin.
Both hormones operate in opposite action, glucagon respond to low blood sugar levels while insulin respond to high blood sugar levels.