Question

what was one way early prokaryotes different from modern eukaryotes?
a) they were large in size
b) they had multiple cells
c) they had no nucleus
d) they required oxygen to survive
the great oxygenation event demonstrates that *
a) environmental changes can cause both extinctions and new evolutionary opportunities
b) oxygen always benefits all life forms
c) mass extinctions only occur due to meteorite impacts
d) early organisms were too simple to adapt

Explanation:

Early prokaryotes were simple, single - celled organisms without a nucleus. Modern eukaryotes have a nucleus and more complex cell structures. The Great Oxygenation Event led to significant environmental changes. It caused some anaerobic organisms (which couldn't tolerate oxygen) to go extinct and also provided new evolutionary opportunities for oxygen - utilizing organisms. Oxygen doesn't always benefit all life forms as some are anaerobic. Mass extinctions can be caused by various factors, not just meteorite impacts. Early organisms could adapt in different ways.

Answer:

1. c. They had no nucleus
2. a. Environmental changes can cause both extinctions and new evolutionary opportunities