Which of the following is not true concerning rainforests?
a. rainforests are responsible for most global oxygen turnover.
b. the undergrowth of rainforests is choked by weeds and plants.
c. rainforests are characterized by high levels of rainfall.
d. not all rainforests are tropical rainforests.

d. Not all rainforests are tropical rainforests.

Not all rainforests are tropical rainforests because some are distinguishable from the others and these rainforests has its own designated climate that allows the specific species of plants to grow and thrive in that environment. 

Ichoose a as my answer

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.