What percentage of a radioactive species would be found as daughter material after seven half–lives?
choices
a. 70%
b. 7%
c, 6.25%
d. 0.78%

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

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse