Which of the following are important products of rainforests?
a.
timber
b.
pharmaceuticals
c.
oxygen
d.
all of the above

Rainforest can be harvested for an assortment of important products for human consumption.Timber is an obvious product, as wood is harvested from most any forest. Pharmaceuticals are another product, as tropical plants can be made into a variety of medicines. Finally 20% of the world's oxygen is produced in rainforest, and oxygen is vital to human survival. The answer is therefore d) all of the above.

C. a mature ovule of a plant.