Explain the role of a primary consumer and a secondary consumer in a food web.

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains