Allowing local people to collect fallen branches from trees in a protected forest is an example of the philosophy of
a.
b.
recycling
sustainable use
c. habitat preservation
d. species reintroduction

bc blah

explanation:

bc blah

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.