In the unit students did extensive investigations that included growing all kinds of seeds in a variety of situations, examining plant structures and their functions, observing several life cycles of certain plants, and so on.
(extensive investigations; included; growing all kinds of seeds in a variety of situations, examining plant structures and their functions, observing several life cycles of certain plants, and so on)
extensive investigations
included
growing all kinds of seeds in a variety of situations, examining plant structures and their functions, observing several life cycles of certain plants, and so on