ati teas 7 science

Correct Answer: B

Rationale: The correct answer is B: One layer. Simple epithelium consists of a single layer of cells. This arrangement allows for efficient diffusion and absorption due to the short distance between cells and the underlying tissues. Option A is incorrect because epithelial tissue always has at least one layer. Option C is incorrect as it describes stratified epithelium, which has two or more layers. Option D is incorrect as it refers to stratified squamous epithelium, not simple epithelium.

Correct Answer: C

Rationale: Gold (C) is the correct answer because it is highly malleable and does not tarnish. Gold is a popular choice for jewelry due to its durability and resistance to corrosion. Iron (A) is not commonly used in jewelry due to its susceptibility to rust. Copper (B) is malleable but prone to tarnishing. Silver (D) is malleable but can tarnish over time, making it less ideal for long-lasting jewelry pieces.

Correct Answer: A

Rationale: The correct answer is A: Pulmonary vein. The pulmonary vein is the only blood vessel among the choices that carries oxygenated blood from the lungs back to the heart. The pulmonary artery (B) carries deoxygenated blood from the heart to the lungs. The aorta (C) carries oxygenated blood from the heart to the rest of the body. The vena cava (D) carries deoxygenated blood from the body back to the heart. Therefore, the pulmonary vein is the only blood vessel in the list that fits the description of carrying oxygenated blood from the lungs to the heart.

Correct Answer: B

Rationale: The correct answer is B (25 grams) as the recommended daily fiber intake for adults by the American Heart Association is 25-30 grams. Fiber helps with digestion, heart health, and weight management. Option A (10 grams) is too low and insufficient for daily needs. Option C (35 grams) and D (50 grams) are excessive and may lead to digestive issues like bloating or gas. Therefore, B is the most appropriate choice for optimal health benefits.

Correct Answer: B

Rationale: Step 1: Active immunity involves the body's immune response, meaning the body produces its own antibodies after exposure to a pathogen. Step 2: Passive immunity provides immediate protection through antibodies from an external source, such as maternal antibodies or antibody injections. Step 3: The key difference lies in the origin of the antibodies - body's own immune response (active) vs. external antibodies (passive). Step 4: Choice B correctly identifies this distinction, making it the correct answer. Summary: Choices A, C, and D are incorrect as they do not accurately differentiate between active and passive immunity and provide misleading information about the duration, protection spectrum, and vaccination requirements.