Answer:
C.) Covalent
Explanation:
Oxygen and carbon are both nonmetals.
A.) is incorrect because hydrogen bonds are only formed between hydrogen and either oxygen, nitrogen, or fluorine.
B.) is incorrect because ionic bonds form between nonmetals and metals. In this situation, you have two nonmetals.
C.) is correct because covalent bonds are formed between two nonmetals. A covalent bond will form because oxygen and carbon are nonmetals.
Answer:
One population may compete with another population for food. One population may compete with another population for shelter. One population may serve as a food source for another population.
Explanation:
The cells are different between the different layers of a bone because each layer protects something different than the rest.
Answer:
1. Endocrine
2. Exocrine
Explanation:
The pancreas serves as both endocrine and exocrine gland.
The pancreas is an exocrine gland as the pancreatic acini produce digestive enzymes that are delivered to the small intestine through a network of ducts. The glands that release their secretions by ducts are called exocrine glands.
Islets of Langerhans scattered among pancreatic acini serve the endocrine part of the pancreas. The alpha cells of pancreatic islets secrete hormone glucagon while the beta cells of the islets secrete the hormone insulin directly in the bloodstream. Likewise, the delta cells of pancreatic islets secrete hormone somatostatin. The ductless glands that release their secretions directly into the bloodstream are known as endocrine glands.
