Question

plants serve many roles in an ecosystem

• plants serve as a food source for other organisms
• plants produce oxygen through the process of photosynthesis
• plants can provide habitats for animals
• plants can make and preserve soil.

plants can also be transformed into useful products for people.
which of the following is an example of a product that can be made from plants?
oa. paper
ob. resins
oc. medicine
od. all of these

Explanation:

纸（paper）可由植物纤维制成；树脂（resins）有些植物能分泌；许多药物（medicine）的原料也来自植物。所以这三个选项都符合。

Answer:

D. all of these