Interesting question! To be honest, the
question about DNA is outside of my area of
expertise. I better let a biologist handle that
one. But I can make a suggestion about taking
biology or earth science next year! If you are
very interested in science, then I think you
should take both! If it’s not possible to take
both in one year, perhaps you could try to take
one this year and one in another grade. I may be
biased, but it seems to me that biology,
chemistry, and physics dominate the high school
science curriculum, and that earth science is the
underrepresented physical science. I think that it
is very important to learn about the earth that we
live on and how we interact with its geologic,
hydrologic, atmospheric, and biologic systems.
Most people (in my experience) don’t know very
much about what earth scientists do. Many are
surprised to find out that earth scientists use
all of the other physical sciences, including
chemistry, physics, and biology in our studies.
When I turn around and look at my bookshelf, I see
texts on geochemistry, geophysics, and even
“geomicrobiology”. In earth science, you can apply
all of the other physical sciences to interesting
questions about our earth, and even other planets!
Next generation antibiotics are actually HUGE in
science right now, and will continue to be as
bacteria develop resistance to current antibiotics
(like MRSA has). I would definitely recommend
biology, chemistry, and physics over earth
sciences. Regarding aging, we aren't yet really
sure how it works. You'll get a much better idea
of how DNA and cells work in biology. Living
forever is a lot harder than just keeping DNA
replicating and accurate.
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