1. Briefly outline four possible hypotheses for the emergence of the three domains of life. Which is

1. Briefly outline four possible hypotheses for the emergence of
the three domains of life. Which is best supported (at present) from the
evidence? Which is your favorite hypothesis (this need not be the one you think
is most likely to be true!), and why?

2. It has been said that life could develop on Earth only because
Earth is just the right distance from the Sun. Any closer, and Earth would have
been too hot (like Mercury or Venus); any farther away, there would not have
been sufficient solar energy for the evolution of living things. Recently, communities
of organisms have been found

1. Briefly outline four possible hypotheses for the emergence of
the three domains of life. Which is best supported (at present) from the
evidence? Which is your favorite hypothesis (this need not be the one you think
is most likely to be true!), and why?

2. It has been said that life could develop on Earth only because
Earth is just the right distance from the Sun. Any closer, and Earth would have
been too hot (like Mercury or Venus); any farther away, there would not have
been sufficient solar energy for the evolution of living things. Recently, communities
of organisms have been found in deep-sea vents on Earth. These communities seem
to

get all of their energy from the vents rather than the Sun.
That is, the vent communities derive energy from the inner heat of Earth (which
is provided ultimately by radioactivity). Even more recently, communities of bacteria
have been found deep in subsurface rock. How does this discovery inform
consideration of whether life might exist on other planets or moons that are
not at the right distance from the Sun?

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