(worth 20 points) which of the following explains why it is not easy to tell the directions of movement of pressure centers and fronts from a surface map alone? a. you must know the location of major land masses such as mountains. b. you must know the density and steepness of an approaching front. c. you must know the variations in temperature. d. you must know the pressure changes and the patterns of circulation of the upper air.

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

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.