Ques: Q: The smallest units of matter that retain the unique properties of an element are known as what? Read this paragraph and choose the correct option from the provided answers: All matter is made of tiny particles. Protons, neutrons, and electrons form atoms that bond together to create molecules. Atoms are the smallest units that have the properties of an element. Molecules are the smallest units of a compound. Chemical bonds hold molecules together. Molecules form the different types of minerals. The silicates make up most of Earth's crust. Minerals come together to create the three major rock types. They are igneous, sedimentary, and metamorphic. Igneous rocks form from cooled magma. Sedimentary rocks form from compacted or cemented sediments. Metamorphic rocks are those that have been altered by heat and pressure. These three rock types are the material part of the rock cycle. They are connected by different processes. Different processes convert any type of rock into any other type of rock. These processes are weathering and erosion, crystallization, and burial and pressure, among others. Each rock contains a story of how it formed. For most rocks it is possible to know what it formed from. Choices: - protons - molecules - neutrons - atoms A:
Ans: atoms

Ques: Q: What did volcanic gases help to form on earth? Read this paragraph and choose the correct option from the provided answers: When Earth first formed, it was a fiery hot, barren ball. It had no oceans or atmosphere. Rivers of melted rock flowed over its surface. Gradually, the planet cooled and formed a solid crust. Gases from volcanoes formed an atmosphere, although it contained only a trace of oxygen. As the planet continued to cool, clouds formed and rain fell. Rainwater helped form oceans. The ancient atmosphere and oceans would be toxic to modern life, but they set the stage for life to begin. Choices: - water - plants - rocks - atmosphere A:
Ans: atmosphere

Ques: Q: What element is essential for amino acid and nucleic acid production? Read this paragraph and choose the correct option from the provided answers: Choices: - oxygen - carbon - hydrogen - nitrogen A:
Ans: nitrogen

Ques: Q: What type of experiment involves two identical experiments carried out side-by-side, with and without an independent variable? Read this paragraph and choose the correct option from the provided answers: One way to test a cause and effect hypothesis is to perform a controlled experiment. In a controlled experiment, two identical experiments are carried out side-by-side. In one of the experiments, the independent variable being tested is used, and in the other experiment, the control, the independent variable is not used. Choices: - trial run - defined experiment - blind test - controlled experiment A:
Ans:
controlled experiment