The Oldest Hominid So Far Discovered Dates Back to

Q84: An explosion of genetic diversity similar to

Q85: The first living organisms probably resembled<br>A) single-celled

Q86: What was one reason that RNA was

Q87: In the original Miller-Urey experiment it was

Q88: Microfossil evidence suggests that life<br>A) originated when

Q90: Based on current scientific evidence, what is

Q91: The "oxygen crisis" occurred around<br>A) 2 billion

Q92: The Cambrian Explosion began approximately<br>A) 2.1 billion

Q93: One of the first large organisms to

Q94: Microfossils found in northwestern Australia in 2011