What does it mean to say the Earth works in a cycle. a. No new matter comes in
b. The amount of energy available is fixed and only changes forms from organism to organism
c. Nutrients are given from the sun and are never recycled. Only energy is recycled

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.

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

What molecule does hemoglobin decay into over time