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in plants: the first plant to become established in an area.in plants: the first plant to become established in an area.in plants: the first plant to become established in an area.in plants: the first plant to become established in an area.
the effect of the relative lengths of daylight and darkness on the physiology and behaviour of...
a biological classification group (taxon) that is divided into families.
structure in animal cells thought to form the spindle fibres during cell division.
having similar parts regularly arranged around a central axis.