Which of the following environmental risks is most likely to lead to digestive health issues?
a. meat contamination
b. air pollution
c. fertilizer use
d. none of the above

Meat contamination because humans do not eat air or fertilizer so meat contamination is the only logical answer.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.