If they will eventually run out, which of the following explains why nonrenewable energy resources are still so widely used? Renewable energy sources are not as reliable in terms of power output. Renewable energy is more polluting than nonrenewable energy. Renewable energy can be more expensive than nonrenewable energy. Renewable energy provides less power in some areas.

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled

Isotopes of the same element have differ in their