What are the unstable reactants of radioactive decay called? a. parent isotopes
b. daughter nucelli
c. nucleus
d. neutrons

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.

Which soil layers comprise the topsoil? o horizon a horizon b horizon c horizon

Graph titles are seldom both simple and descriptive. true or false