Which of the following would be the best way for an ecologist to determine the effects of an industrial waste chemical on the survival of a fish species?
a. conducting experimental work in a lab.
b. conducting library research
c. constructing math medical models on a computer
d. observing the effect of increasing the amount of chemical in nature

A) conducting experimental work in a lab

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

The answer would be d. pili