18. Which of the following species would be most likely to survive if a nearby (

Question

18.

Which of the following species would be most likely to survive if a nearby (~7000 light years) GRB happened with its beam toward Earth?

Select one:

A. humans

B. phytoplankton

C. sea urchins - which begin life as a planktonic larva

D. a deep-sea anglerfish

19.

Which extinction on Earth might have been due to a GRB?

Select one:

A. 250 Myrs ago: The Permian-Triassic Event

B. 205 Myrs ago: The Triassic-Jurassic Event

C. 360 Myrs ago: The Late Devonian Event

D. 65 Myrs ago: The Cretaceous-Tertiary (KT) Event

E. 450 Myrs ago: The Ordovician-Silurian Event

20.

What is the evidence for a GRB causing a mass-extinction on Earth?

Select one:

a. An increased abundance of muons found in fossils with an age of about 250 million years.

b. Air bubbles from Antarctic ice cores show a depletion of the ozone layer 65 million years ago.

c. Strange, gamma-ray mutated life-forms present in the fossil record.

d. There is no direct evidence. It is suggested by the pattern of death in a mass extinction matching that expected to be caused by a GRB.

e. A spike in the abundance of iron-60 found in rocks dating back 450 million years ago.

Explanation / Answer

18) C. sea urchins - which begin life as a planktonic larva

larva were more likely to cover a broad geography, but they were more likely to go extinct during this time

19) E. 450 Myrs ago: The Ordovician-Silurian Event

Gamma-ray burst may have caused one of the five greatest mass extinctions on Earth, such as the Ordovician extinction that occurred 440 million years ago

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