History of LIfe

The fossil record shows

• that most organisms that ever lived on Earth are now

• that only bones and teeth can become fossilized.

• hat fossils form under many different conditions.

• a complete record of every organism that's existed on

Fossilized evidence of Earth’s first forms of life would consist of

• vertebrates from the Precambrian.

• prokaryotes from the Precambrian.

• eukaryotes from the Precambrian

• invertebrates from the Precambrian. invertebrates from the Precambrian.

Which organsim did not exist at the same time as Homo sapiens?

• Dinosaurs

• Jellyfish

• Wooly Mammoth

• Fishes

How did early organisms cause earth to cool?

• The first photosynthetic organisms converted 02 to CO2

• The first photosynthetic organisms converted CO2 to O2

• The first photosynthetic organisms created oceans

• None of the answers is correct

One scientific hypothesis about the origin of life holds that

• RNA replaced DNA as the most stable info-storing molecule.

• RNA existed before DNA.

• proteins that duplicate themselves are used in info storage.

• as cells evolved, they stopped using RNA entirely. as cells evolved, they stopped using RNA entirely.

How old is the earth?

• A little over 2000 years

• about 100,000 years

• about 2 million years

• about 4.6 billion years about 4.6 billion years

The endosymbiotic theory proposes that eukaryotic cells arose from

• individual prokaryotic cells.

• multicellular prokaryotes.

• mutualistic relationships formed by prokaryotes.

• mutualistic relationships formed by eukaryotes.

The length of time required for half of the radioactive atoms in a sample to decay is its

• half-life

• relative date.

• radioactive date

• period.

Which of these labels for fossils in a museum display contains an error?

• Dinosaur (middle mesozoic)

• Early human (late cenozoic)

• Early mammal (middle paleozoic)

• Early marine invertebrate (early paleozoic) Early marine invertebrate (early paleozoic)

The process by which 2 species evolve in response to changes in each other over time is called

• convergent evoluton.

• adaptive radiation.

• coevolution.

• punctuated equilibrium.