ati teas 7 science

Correct Answer: C

Rationale: The correct answer is C: Ecology. Ecology is the scientific study of the relationships between organisms and their environment. It focuses on the interactions between living organisms and their surroundings. Zoology (A) is the study of animals, Botany (B) is the study of plants, and Genetics (D) is the study of genes and heredity, which are not directly related to the relationships between organisms and their environment. Therefore, Ecology is the most appropriate choice for this question.

Correct Answer: A

Rationale: The correct answer is A: Stapes. The stapes is the smallest bone in the human body, located in the middle ear. It plays a crucial role in transmitting sound vibrations to the inner ear. The other choices are incorrect because the patella is a knee bone, phalanges are finger bones, and ribs are chest bones, none of which are the smallest bone in the body. The stapes' small size and specific location make it uniquely suited for its function in hearing.

Correct Answer: B

Rationale: The correct answer is B: In a covalent bond, the shared electrons spend more time closer to the more electronegative atom. This is because the more electronegative atom attracts the electrons more strongly, causing them to be closer to that atom. This creates a partial negative charge on the more electronegative atom and a partial positive charge on the other atom. This distribution of electron density contributes to the stability of the covalent bond. Choices A, C, and D are incorrect because: A: Are completely transferred to one atom - This describes an ionic bond, not a covalent bond. C: Remain equidistant between the two atoms - Shared electrons in a covalent bond are not equidistant but are closer to one atom. D: Do not influence the bond strength - The distribution of shared electrons significantly influences the strength and properties of a covalent bond.

Correct Answer: B

Rationale: The correct answer is B: Acting as a protective sac surrounding the heart. The pericardium is a double-walled sac that surrounds and protects the heart. It provides physical protection against external forces and prevents overfilling of the heart. Choices A, C, and D are incorrect as they do not accurately describe the function of the pericardium. Choice A refers to the role of heart valves, choice C refers to the role of the heart's electrical system, and choice D refers to the function of the atrioventricular node.

Correct Answer: C

Rationale: The correct answer is C: Nasal passages. Nasal passages contain mucous membranes that produce mucus to humidify and warm inhaled air. The mucus traps particles and adds moisture to the air, making it easier for the lungs to absorb oxygen. The trachea (A) is a passageway for air but does not actively humidify or warm it. The larynx (B) is responsible for sound production and protecting the airway, not for conditioning air. The bronchi (D) are branching airways that lead from the trachea to the lungs, but they do not play a direct role in humidifying or warming inhaled air.