Chapter 25: The History of Life on Earth

Match the following dates to what occurred at the time.

• 440 MYA

• cambrian explosion

• 2.7 BYA

• jawed vertebrates appeared

• 1.8 BYA

• atmospheric oxygen

• 535 MYA

• prokaryotic cells appear

• 3.5 BYA

• eukaryotic cells appear

Match the following dates to what occurred at the time.

• 375 MYA

• land is colonized

• 500 MYA

• humans

• 195,000 YA

• flowering plants

• 140 MYA

• tetrapods

Match the following dates to what occurred at the time.

• 541 MYA

• Mesozoic Era

• 252 MYA

• Paleozoic Era

• 2.5 MYA

• Neoproterozoic Era

• 66 MYA

• Cenozoic Era

How many billions of years ago did first life appear?

Mathematical Equivalence

ON

How many billions of years ago did the first oxygen producers arise?

Mathematical Equivalence

OFF

How many billions of years ago did the first eukaryotic organism appear?

Mathematical Equivalence

OFF

How many billions of years ago did the first multicellular organism appear?

Mathematical Equivalence

OFF

How many millions of years ago did the Cambrian explosion occur?

Mathematical Equivalence

OFF

How many millions of years ago did the first land dwelling animals appear?

Mathematical Equivalence

OFF

How is it theorized that life began on earth?

• Self replicating molecules

• Abiotic Synthesis

• Organic Molecule

  --->

  Macromolecules

• Protocell membranes maintained internal chemistry