Question

Question 9

What material is usually dated when scientists use the Potassium-Argon (K/Ar) dating method to date fossils?

a. Bones

b. Stone tools

c. Ostrich shells

d. Teeth

e. Volcanic rocks

Question 10

__________ is a radiometric dating method popular with archaeologists that can be used to date materials up to 75,000 years old.

a. Carbon-14

b. Paleomagnetism

c. Dendrochronology

d. K/Ar

e. Biostratigraphy

Question 11

Potassium-40 (40K)

a. decays to the gas, argon-40 (40Ar).

b. decays to carbon-14.

c. has a half-life of 1.25 billion years.

d. all of these

e. A and C only

Question 12

Sahelanthropus has an unusual combination of ancestral and derived characteristics. The derived traits include:

a. a small braincase and a small vertical face

b. a large braincase and huge browridges.

c. a small braincase and ape-like teeth

d. a very prognathic face and small browridges.

e. none of these

Answer 1

9. The correct answer is Option E. Volcanic rocks are used when scientists use the Potassium-Argon (K/Ar) dating method to date fossils.
10. The correct answer is Option A. Carbon dating is a radiometric dating method popular with archaeologists that can be used to date materials up to 75,000 years old.
11. The correct answer is Option E. Both A and C are correct.
12. The correct answer is Option C. The derived traits include a small braincase and ape-like teeth.