PLEASE HELP! A sample of radioactive waste will have reached an acceptable activity level at 0.5 curies . If the half - life of the sample is 5 years and the sample can be disposed of after a minimum of 20 years , what must the original activity level of the sample be ?

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .