Early toxicologists were at a disadvantage when trying to identify and quantify poisons because they lacked
(a) organization
(b) ethics and professionalism
(c) a legal system to back them
(d) sensitive chemical tests and analytical instruments

(D) sensitive chemical tests and analytical instruments

Explanation:

Toxicology is defined as a science that aims to study the harmful effects arising from chemicals in the body of living beings.

Early toxicologists had archaic chemical tests devoid of any kind of technology, and did not have analytical instruments, or did not have adequate analytical instruments so that they could properly analyze and test the effects of the chemicals. This lack of sensitive equipment and testing has made it difficult to research toxicology in ancient times, but over time, these elements have adapted and met the criteria needed to make toxicology the science we know today.

answer: my answer would be a) scheduling workouts with your friend for consistent days and time

explanation:

for me personally i would be much more likely to go to the gym with a friend because i wouldn't want to cancel on them or stand them up.