A timeline of important discoveries about DNA is shown below. These discoveries have contributed to our current knowledge about DNA.
Image
Which statement best summarizes the development of knowledge about DNA over time?
a
Ideas about DNA have remained unchanged over time.
b
Scientists gained more knowledge about DNA as new evidence became available.
c
Past knowledge about DNA was discarded as each new discovery was made.
d
Changes in ideas about DNA are based on opinion.
b
Scientists gained more knowledge about DNA as new evidence became available.