Exam 6: The Origin and Evolution of Life on Earth

What do we mean by "The Oxygen Crisis" in relation to the evolution of life on Earth?

A small piece of debris that burns up in the atmosphere is called a

Modern mammals are descendents of

Most likely, oxygen was first released into the atmosphere by

Analysis of comet dust collected and returned to Earth by the Stardust mission has shown that

Life probably did not originate on the land surface because

The first living organisms to develop photosynthesis were probably

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

The first molecules of RNA were probably made

Microbes in the top layers of living stromatolites in western Australia obtain their energy from

What is the most compelling piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?

If we eventually find life on Mars, we could tell if panspermia may have occurred between Mars and Earth if

The first eukarya appeared

The colonization of land by plants appears to have begun about

Microfossil evidence suggests that life

Current geological evidence suggests that life

To date, meteorites have been identified originating from which planets and moons?

What was NOT an important source of prebiotic molecules (e.g., amino acids) on the early Earth?

As life on Earth evolved, its DNA

During the Carboniferous Period,