Problem:OPTIONS:
- pathogens
- hemoglobin
- potassium
- plasma

Answer the following question given this paragraph: Did you know that blood is a tissue? Blood is a fluid connective tissue that is made up of red blood cells, white blood cells, platelets, and plasma. The cells that make up blood are pictured below ( Figure below ). The different parts of blood have different roles. Q: Blood is made up of red blood cells, white blood cells, platelets, and what else? A:
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A: plasma

Problem:OPTIONS:
- carbon monoxide
- hydrogen
- oxygen
- carbon dioxide

Answer the following question given this paragraph: Introduction Breathing is an involuntary event. How often a breath is taken and how much air is inhaled or exhaled are tightly regulated by the respiratory center in the brain. Humans, when they aren't exerting themselves, breathe approximately 15 times per minute on average. Canines, like the dog in Figure 39.1, have a respiratory rate of about 1530 breaths per minute. With every inhalation, air fills the lungs, and with every exhalation, air rushes back out. That air is doing more than just inflating and deflating the lungs in the chest cavity. The air contains oxygen that crosses the lung tissue, enters the bloodstream, and travels to organs and tissues. Oxygen (O2) enters the cells where it is used for metabolic reactions that produce ATP, a high-energy compound. At the same time, these reactions release carbon dioxide (CO2) as a by-product. CO2 is toxic and must be eliminated. Carbon dioxide exits the cells, enters the bloodstream, travels back to the lungs, and is expired out of the body during exhalation. Q: What gas is expired out of the body during exhalation? A:
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A: carbon dioxide

Problem:OPTIONS:
- prostate
- urethra
- kidney
- urinary bladder

Answer the following question given this paragraph: The urinary bladder is a hollow and muscular organ. It is shaped a little like a balloon. It is the organ that collects urine. Q: What is the hollow and muscular balloon-shaped organ that collects urine? A:
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A: urinary bladder

Problem:OPTIONS:
- colors
- shapes
- electricity
- light

Answer the following question given this paragraph: Echinoderms lack respiratory and excretory systems. Instead, the thin walls of their tube feet allow oxygen to diffuse in and wastes to diffuse out. Echinoderms also lack a centralized nervous system. They have an open circulatory system and lack a heart. On the other hand, echinoderms have a well-developed coelom and a complete digestive system. Echinoderms use pheromones to communicate with each other. They detect the chemicals with sensory cells on their body's surface. Some echinoderms also have simple eyes (ocelli) that can sense light. Like annelids, echinoderms have the ability to regenerate a missing body part. Q: What can echinoderms sense with their simple eyes? A:
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A:
light