Since the average life span of a butterfly is two to three weeks, roughly 250 butterfly pupae will be shipped to the Museum weekly for the duration of the exhibition.
(the average life span of a butterfly; is; two to three weeks) (roughly 250 butterfly pupae; will be shipped; to the Museum weekly; for the duration of the exhibition)
the average life span of a butterfly roughly 250 butterfly pupae
is will be shipped
two to three weeks
to the Museum weekly for the duration of the exhibition