In the 19th century, a central European scientist determined patterns in how pea plants pass on traits to their offspring. In the mid-20th century, British and American scientists determined the structure of DNA. In 2003, scientists from several countries defined the genetic makeup of humans in great detail.

These events illustrate that...
A.
scientists from any culture can make new discoveries and build on previous discoveries.

B.
scientists from different cultures cannot seem to agree on genetics.

C.
new discoveries show that previous scientific work should never have been done.

D.
modern scientists are not as intelligent as the scientists of the last century.