Researchers recently discovered a gene in humans that previously was unknown to science. Which statement best explains why the gene probably was not discovered much sooner?
The gene only recently evolved in humans. The technology used to study genes is still being developed. Scientists were not interested in genes until a few years ago. Scientists were sure they had already discovered every possible gene.
Question: Researchers recently discovered a gene in humans that previously was unknown to science. Which statement best explains why the gene probably was not discovered much sooner?
A. The gene only recently evolved in humans.
B. The technology used to study genes is still being developed.
C. Scientists were not interested in genes until a few years ago.
D. Scientists were sure they had already discovered every possible gene.
Answer: