All of the following contributes to turbulent blood flow except A) when there are irregularities in the vessel wall. B) at high flow rates. C) when there are sudden changes in vessel diameter. D) third and fourth heart sounds. E) when heart valves open.

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 are the types of mutations, and how does each alter the encoded protein? college level answer

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the