Question

question 44 (2 points)
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during the twentieth century, science and medicine greatly improved the lives of billions of people, with discoveries in all of the following except
dna.
penicillin.
vaccines.
cures for all cancers.

Explanation:

To solve this, we analyze each option:

• DNA: Discovered (structure) in the 20th century (1953), so it's a 20th - century science/medicine discovery.
• Penicillin: Discovered in 1928 (20th century) and was a major medical breakthrough.
• Vaccines: Many vaccines (e.g., polio vaccine in the mid - 20th century) were developed or improved in the 20th century.
• Cures for all cancers: As of the 20th century (and even now), there is no cure for all types of cancer. Cancer is a complex group of diseases, and while there are treatments and some cures for specific cancers, a universal cure for all cancers does not exist. So this is the exception.

Answer:

D. cures for all cancers