ati teas 7 science

Correct Answer: A

Rationale: Acceleration is defined as the rate of change of velocity over time. This means that acceleration measures how quickly an object's velocity is changing. By choosing answer A, "Change in velocity over time," you are correctly identifying the definition of acceleration. Choice B, "Speed in a straight line," is incorrect because speed does not take into account the change in velocity, which is vital in defining acceleration. Choice C, "Distance covered in a given time," is incorrect as it pertains to speed or distance traveled, not acceleration, which specifically relates to changes in velocity. Choice D, "Force applied to an object," is incorrect because force is a completely different concept in physics and is not directly related to the definition of acceleration.

Correct Answer: A

Rationale: The correct answer is A: Hypothalamus. The hypothalamus plays a vital role in regulating body temperature by responding to internal and external temperature changes. It coordinates the body's response to maintain a stable temperature through processes like sweating or shivering. B: Cerebellum is responsible for coordinating movement and balance, not body temperature regulation. C: Pituitary gland regulates hormone production but not directly involved in body temperature regulation. D: Thyroid gland controls metabolism and energy levels but not primarily responsible for regulating body temperature.

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: C

Rationale: The correct answer is C: Luteinizing hormone (LH). LH surge triggers ovulation by causing the mature ovarian follicle to release the egg. Estrogen and progesterone play important roles in regulating the menstrual cycle but are not the primary triggers for ovulation. FSH stimulates the growth of ovarian follicles but does not directly trigger ovulation.

Correct Answer: B

Rationale: The correct answer is B. Sunscreen protects the skin by absorbing UV rays and converting them to heat. This process prevents the UV rays from penetrating the skin and causing damage. Reflecting UV rays (A) would not be as effective as absorbing them. Blocking UV rays completely (C) is not possible with sunscreen. Stimulating melanin production (D) is not the main mechanism of how sunscreen works to protect the skin.