Ques: Q: What can echinoderms sense with their simple eyes? Read this paragraph and choose the correct option from the provided answers: 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. Choices: - colors - shapes - electricity - light A:
Ans: light

Ques: Q: What does an ammeter measure the flow of? Read this paragraph and choose the correct option from the provided answers: When a contractor builds a new home, she uses a set of plans called blueprints that show her how to build the house. The blueprints include circuit diagrams. The diagrams show how the wiring and other electrical components are to be installed in order to supply current to appliances, lights, and other electric devices. You can see an example of a very simple circuit in the Figure below . Different parts of the circuit are represented by standard circuit symbols. An ammeter measures the flow of current through the circuit, and a voltmeter measures the voltage. A resistor is any device that converts some of the electricity to other forms of energy. For example, a resistor might be a light bulb or doorbell. Choices: - water under pressure - wind - magnetic fields - current through a circuit A:
Ans: current through a circuit

Ques: Q: What amazing machines smash particles that are smaller than atoms into each other head-on? Read this paragraph and choose the correct option from the provided answers: Scientists have built machines called particle accelerators. These amazing tools smash particles that are smaller than atoms into each other head-on. This creates new particles. Scientists use particle accelerators to learn about nuclear fusion in stars. They can also learn about how atoms came together in the early universe. Two well-known accelerators are SLAC, in California, and CERN, in Switzerland. Choices: - nitrogen accelerators - observant accelerators - absorption accelerators - particle accelerators A:
Ans: particle accelerators

Ques: Q: What is the most common fossil fuel? Read this paragraph and choose the correct option from the provided answers: Many of the problems with fossil fuels are worse for coal than for oil or natural gas. Burning coal releases more carbon dioxide than either oil or natural gas. Yet coal is the most common fossil fuel, so we continue to burn large amounts of it. That makes coal the biggest contributor to global warming. Choices: - diesel oil - uranium - methane - coal A:
Ans:
coal