Which process causes hillsides and mountains to gradually get smaller?

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Achild is suffering from fever but the doctor cannot immediately pinpoint the alignment on the basis of this one symptom explain why also mention other two such general symptoms

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis