An isotope of phosphorus has a half-life of 14 days. if you started with a 500 gram sample, how
much would remain after 28 days?

Explanation:

I think zero because 14x2=28 and u start off with 500

Butterflies laying their eggs on milk weed plants occurs at the level of community of the biosphere. A community is characterized by the interaction of different populations, the relationships foster may be mutual, parasitic, symbiotic, etc. Usually a particular population of the community often dominate the community and they are often larger in quantity than all the other.