Is a pacemaker a definitive treatment for a complete heart block?

Florian discovers a rock that is broken into pieces. each piece has several bands. which type of rock does florian predict these pieces will change into when subjected to heat and pressure? igneous magma metamorphic sedimentary

Contrast how pollination is different among gymnosperms and angiosperms.

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels