By comparison, the famous Exxon Valdez spill in the United states in
1989 involved only 37,000 tons. The Prestige in Spain in 2002 carried
a load of 77,000 tons but most of its sank with it to a depth of 4
kilometers.
http://response.restoration.noaa.gov/kids/spills.html
http://directory.google.com/Top/Science/Environment/Energy/Petroleum_i
n_the_Environment/Oil_Spills/?tc=1
http://dmoz.org/Science/Environment/Energy/Petroleum_in_the_Environmen
t/Oil_Spills/
Organelles
Multi-cellular organisms, such as plants and humans, evolved over
billions of years. Ancient bacteria infiltrated the first eukaryotic
cells - i.e., the first cells with a nucleus. They helped these cells
convert food into ATP - the cellular "battery" molecule.
As time passed, these bacteria degenerated. Their remains still occupy
the cytoplasm of eukaryotes in the form of "organelles", tiny organs.
But these remains contain their own DNA - distinct from the host
cell's. They also encompass their own ribosomes - cellular miniature
protein factories. So, in a way these organelles - the mitochondria in
living creatures and the chloroplasts in plants - are separate
organisms.
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