7.11, 7.7, 7.6

If the species diversity decreases…

• Rate of extinction decreases

• Rate of extinction increases

• Results in a decrease in rate of speciation

• Results in an increase in rate of speciation

Extinctions

• Decrease available niches

• Increase available niches

• increase number of species in an area

• decreases rate of speciation

Which gas was not present in earth Earth’s atmosphere?

• Ammonia

• Hydrogen

• Methane

• Oxygen

Organic compounds could have come to Earth on meteorites.

• True

• False

The first genetic material was…

• Carbohydrates

• DNA

• Protein

• RNA

Which of these structures demonstrate common ancestry?

• Analogous Structure

• Homologous Structures

• Convergent Evolution

• Nucleotide structure

Which fossil would be considered the oldest?

• V

• W

• Y

• Z

If the half life of carbon-14 is 5,000 years, how long does it take for 25% of the carbon to be remaining? Note: I am rounding the half-life for easy math

• 2500

• 5000

• 7500

• 10,000

How many half-lives to get to 1/32 of the original amount?

• 4

• 5

• 6

• 7

Vestigial structures show common ancestry…

• True

• False