Homeostasis refers to a. the similarity of genetic traits to one another b. a mixture or solution that is the same thoughout c. the effect of natural selection on human evolution d. the tendency of a cell to maintain a stable internal environment

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

Environmental impacts on evolution : mastery test

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?