You attend a geology lab where you are asked to estimate the age of a fossil. the ratio of parent to daughter elements in the fossil sample is 1: 7. you know that fossils are the remains of living organisms, which have some amount of c-14 isotope. the c-14 isotope, which has a half-life of 5730 years, begins to decay as the organism dies. what would be your estimation of the fossil's age?
a. 2865b. 17,190c. 5730d. 11,460e. 40,110f. 22,920

Mike was adopted, and his biological family history is unknown. although he is healthy, he would like some understanding of his genetic makeup, including potential health risks and genes that he could pass on to his children. mike has heard about commercial laboratories that can compare segments of your dna to those of people with common hereditary diseases in order to give you some idea of how susceptible you are to the diseases. the results of these types of tests are highly inconclusive. if mike's dna showed that he shares similarities in a segment of dna with people who have a given disease, his chances of developing that disease or passing it on to his children may be slightly elevated, but they are not 100 percent. these tests can cost more than $2,500 and are not covered by many insurance companies. do you think that mike should undergo the genetic tests? explain your answer. what are the potential pros and cons of having such tests done? describe how the availability of these genetic tests might affect the frequency of genetic diseases in individuals and populations.

Why does sexual reproduction result in more genetic variation in a species

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?