Step-by-step explanation:
B: The earliest organisms were less diverse and simpler.
Based on the fossil record, scientists have discovered that the earliest organisms were simpler and less diverse than those that followed. These earliest organisms were single-celled and lacked complex structures like nuclei or mitochondria. Over time, through processes like evolution and natural selection, these simple organisms diversified and evolved into more complex forms, leading to the rich diversity of life on Earth that we see today.