In the investigation where we combined the bath bomb with water, we saw bubbles forming but we did not see an increase in the overall mass. This happened because.

a - In a closed system, no matter can get in or out so the mass stays the same.

b - In an open system, no matter can get in or out so the mass stays the same.

c - All matter is made of small particles that are too small to be seen.

d - Matter has mass and takes up space. (not this one)

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

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.