The form and physiology of leaves vary
according to the ---- in which they develop:
for example, leaves display a wide range of
adaptations to different degrees of light and
moisture.
relationship
species
sequence
patterns
environment
One theory about intelligence sees ---- as the
logical structure underlying thinking and
insists that since animals are mute, they must
be ---- as well.
Though ---- in her personal life, Edna St.
Vincent Millay was nonetheless ---- about
her work, usually producing several pages
of complicated rhyme in a day.