DNA is made up the nucleotide bases: A C G U and RNA is made up the nucleotide bases A T C G true or false

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

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?