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all the ecosystems on the Earth, all the species within these ecosystems and the genetic information within all the individuals of each species
a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.
an enzyme that catalyses (speeds up) the hydrolysis (breaking) of a chemical bond.
the Latin name of an organism, consisting of the genus and the species names.
all the different ecosystems with their numerous and varied organisms.