Which test would be useful for determining if multiple male samples are related?

a. mtdna b. rflp c. y-chromosome d. none of these

List 4 main components of air in their molecular form

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

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt