The process of chemical cycling is known as a biogeochemical cycle because it
a. takes places over a long period of time
b. withdraws the chemical form the atmosphere as a gas
c. absorbs the chemical involved from the sediment
d. involves both living and nonliving components

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

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.

What are potential sources of error in marta’s experiment