How do scientists know that the mantle is less rigid than crustal rocks? A)Scientists use materials from volcanic eruptions to study the mantle.
B)Scientists have collected samples from the mantle.
C)Satellite images provide information about the mantle.
D)Scientists use seismic waves to collect information about the mantle.

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.