Answer:
The correct answer is:
d. Cocaine, the first topical anesthetic drug, was introduced in 1880.
Explanation:
It is certainly true that Cocaine was introduced in the medical field for its anesthetic use in 1880, nevertheless it was not the first topical anesthetic drug used by medicine. The first discovery about anesthetic purposes was in 1844 with the use of nitrous oxide. Later on, ether was introduced to the field of anesthetics in 1846, and finally specialists talked about chloroform in 1847 before the later use of cocaine as anesthesia in the medical spheres.
Answer:
external
Explanation:
The process of applying the conclusion of a particular scientific study into a study which is outside its context is said to be external validity. The conclusions derived in one particular study is applied to other situations through external validity. There are cases when such generalization brings a negative result to the study. Also, the factor of generalization is limited to some extent.
23 hours 56 minutes and 4 seconds or 24 hours
