*Question*
Answer the following question given this paragraph: Q: The skeleton of lampreys is made of what? Choices: - ligament - collagen - chitin - cartilage A:
**Answer**
cartilage

*Question*
Answer the following question given this paragraph: Many plants also produce hormones and toxins to fight pathogens. For example, willow trees, like the one in Figure below , produce salicylic acid to kill bacteria. The same compound is used in many acne products for the same reason. Q: What do willow trees produce to kill bacteria? Choices: - facultative acid - Posion - bacterial acid - salicylic acid A:
**Answer**
salicylic acid

*Question*
Answer the following question given this paragraph: Carbon is one of the most common elements found in living organisms. Chains of carbon molecules form the backbones of many organic molecules, such as carbohydrates, proteins, and lipids. Carbon is constantly cycling between living organisms and the atmosphere ( Figure below ). The cycling of carbon occurs through the carbon cycle . Q: Which common element is the most found in living organisms? Choices: - hydrogen - oxygen - monoxide - carbon A:
**Answer**
carbon

*Question*
Answer the following question given this paragraph: Only a tiny fraction of the ocean floor has ever been studied. Why? Humans can't travel deep below the water's surface without special vehicles. The pressure of the water is too great. Total darkness and extreme cold make it even more difficult. That's why people have worked for decades to invent technology for studying the ocean floor. Q: What is the name of artificial barriers that people build to protect shorelines? Choices: - seawalls - domes - outcroppings - breakwaters A:
**Answer**
breakwaters