Which of the following correctly describes where early earth's water came from?

a. rains from violent storms created oceans

b. ice on mountainous structures melted

c. collisions between earth and stars released water

d. carbon in earth's crust converted into water vapor that was then condensed

Draw the structure of dna nucleotide with adenine as nitrogenous base

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.

Whats one way that rocks do not follow the typical rock cycle pathway?