ATI TEAS Science

Correct Answer: A

Rationale: The correct answer is A: A control. A control in an experiment is used as a standard for comparison because it remains unchanged and is not subjected to the experimental treatment. By comparing the results of the experimental group to the control group, researchers can determine the effectiveness of the treatment. Variables (B) and constants (C) are factors that are manipulated or kept consistent, respectively, in an experiment but do not serve as a standard for comparison. Collected data (D) is the outcome of the experiment and is not used as a standard for comparison.

Correct Answer: C

Rationale: Rationale: 1. According to Charles's Law, when pressure on a gas in a closed system at constant volume is increased, the temperature will also increase. 2. This is because the gas molecules will collide more frequently and with greater force, leading to an increase in kinetic energy and thus temperature. Summary: A: Incorrect - Temperature will not stay the same due to the direct relationship between pressure and temperature. B: Incorrect - Temperature will not decrease when pressure is increased in a closed system at constant volume. D: Incorrect - The relationship between pressure and temperature is known and can be determined.

Correct Answer: D

Rationale: The correct answer is D: Arteries. Arteries carry oxygen-rich blood away from the heart to the body tissues. They have thick, muscular walls to withstand the high pressure of blood pumped from the heart. Veins (A) carry oxygen-poor blood back to the heart. Intestines (B) are part of the digestive system, and bronchioles (C) are small air passages in the lungs.

Correct Answer: A

Rationale: To represent 8,600,000,000,000 in scientific notation with two significant figures, we need to move the decimal point to have one non-zero digit before it. Step 1: Write the number in scientific notation: 8.6 x 10^12 Step 2: Check the significant figures: 8.6 has two significant figures. Step 3: Ensure the exponent matches the number of zeros in the original number. Rationale: Choice A is correct as it follows the rules for converting a number to scientific notation with two significant figures. Choices B, C, and D are incorrect because they do not correctly represent the original number in scientific notation with two significant figures. Choice B has the incorrect sign for the exponent, choice C has the incorrect exponent value, and choice D has an unnecessary zero after the decimal point.

Correct Answer: D

Rationale: The correct answer is D because bones are resistant to shattering due to the intricate balance of minerals like calcium and phosphorus, along with collagen fibers. Calcium salts alone (choice A) only provide hardness, not flexibility. Collagen fibers (choice B) provide strength but not hardness. Bone marrow and blood vessels (choice C) support bone health but don't contribute directly to resistance to shattering. The combination of minerals and collagen fibers in choice D provides both hardness and flexibility, making bones resistant to shattering.