What does the half-life of a radioisotope represent? A. It represents the type of radiation that is being emitted by the radioactive material.

B. It represents the amount of energy produced by the isotope's radioactive decay.

C. It represents the time it takes for half of the material to decay to a daughter element.

D. It represents how long the radioactive material has been in existence in that form.​

what are the choices?

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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