Q: What is a process where some substances called reactants change chemically into different substances called products? 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? Choices: - fish - sharks - whales - jellyfish A:
jellyfish

Q: The heart, blood vessels, and blood make up which system in the body? Choices: - digestive - pulminary - respiratory - cardiovascular A:
cardiovascular