human
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?

Choices:
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.
gpt
The correct answer is 1: The technology used to study genes is still being developed..