How many roundworms have been identified? How many are expected to exist?
a. Over 2,000 identified, with an estimated 100,000 expected to exist.
b. Over 10,000 identified, with an estimated 1 million expected to exist.
c. Over 50,000 identified, with an estimated 500,000 expected to exist.
d. Over 100,000 identified, with an estimated 1 billion expected to exist.
