<span>-- There are four of them, spread over several hundred miles of ocean.
-- Together, they form the last British Overseas Territory.
-- Their TOTAL area is about 47 square kilometers (18 square miles).
-- Only Pitcairn, the second largest one, is inhabited. In 2013,
its total population was 56 .
-- The island is inhabited by the descendants of the Bounty mutineers
and the Tahitians who landed there with them (in 1789).
-- Fletcher Christian was the officer who led the mutiny, and almost all of
the 56 current residents are members of families named Christian.
-- Pitcairn is the national jurisdiction (nation) with the smallest population
in the world.</span>
Well, the hydrosphere is moving water to provide life for the biosphere. the geosphere is blocking the rain from the hydro and atmosphere from producing life past where it is blocking, so, in essence, the hydrosphere is "moved" into the atmosphere, where it drops onto the geosphere, creating the possibility for life in the biosphere everywhere that is not being "bullied" for lack of better term by the mountains blocking rain.
I'm pretty sure it's the Eichhornia crassipes. It is a water hyacinth, and it was overgrown in the Lake Victoria area.
The movement of groups from one country,place, or locality to another
I'd say D, as we don't affect the earth as we get more of it.