If a student selects only one plant and clicks the Cross button, then the plant self-fertilizes and the offspring appear below.
(a student; selects; only one plant) (a student; clicks; the Cross button) (the plant self-fertilizes and the offspring; appear below; T:then)
a student a student the plant self-fertilizes and the offspring
selects clicks appear below
only one plant
the Cross button
T:then