Q: What is a process where some substances called reactants change chemically into different substances called products? Read this paragraph and choose the correct option from the provided answers: The student athlete in Figure below is practically flying down the track! Running takes a lot of energy. But you don't have to run a race to use energy. All living things need energy all the time just to stay alive. The energy is produced in chemical reactions. A chemical reaction is a process in which some substances, called reactants, change chemically into different substances, called products. Reactants and products may be elements or compounds. Choices: - crystals reaction - carbon reaction - non-chemical reaction - chemical reaction A:
chemical reaction

Q: What type of animal in the sea spend most of their lives as medusae? Read this paragraph and choose the correct option from the provided answers: Jellyfish spend most of their lives as medusae. They live virtually everywhere in the ocean. They prey on zooplankton, other invertebrates, and the eggs and larvae of fish. Choices: - fish - sharks - whales - jellyfish A:
jellyfish

Q: The heart, blood vessels, and blood make up which system in the body? Read this paragraph and choose the correct option from the provided answers: The cardiovascular system is made up of the heart, the blood vessels, and the blood. Choices: - digestive - pulminary - respiratory - cardiovascular A:
cardiovascular