What is the half-life of an isotope that decays to 6.25% of its original activity in 18.9 hours?

Starch and are common polysaccharide carbohydrates found in plants. sucrose glycogen fructose cellulose

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

Why do oxygen have a strong attractive force for electrons