Exam 6: The Origin and Evolution of Life on Earth

One type of early protocell (pre-cells) probably consisted of small droplets of

Impacts of large asteroids on the Earth's surface generally result in

Why is the claim of the discovery of microfossils controversial?

An explosion of genetic diversity similar to that which occurred during the Cambrian Period hasn't happened recently, most likely because

The first living organisms probably resembled

What was one reason that RNA was eventually replaced by DNA as the molecule of choice for storing genetic information?

In the original Miller-Urey experiment it was assumed that carbon and nitrogen in the early atmosphere were present as

Microfossil evidence suggests that life

The oldest hominid so far discovered dates back to

Based on current scientific evidence, what is the likelihood that life on Earth was created by some omnipotent being?

The "oxygen crisis" occurred around

The Cambrian Explosion began approximately

One of the first large organisms to develop the means to live on land were probably

Microfossils found in northwestern Australia in 2011 appear to have been

During the Carboniferous Period,

Current evidence suggests that life on Earth

Why are clay surfaces good at promoting the formation of biological polymers?

Chemical reactions which remove oxygen from the atmosphere are known as

If a fossil were to be discovered which was 3.7 billion years old this would tell us that life on Earth must have arisen

The "top-down" approach to creating artificial life starts