Question

value: 10
a fossil is found on top of two layers of rock with relative dates of 280 mya and 250 mya, what is the approximate age of the fossil?
○ a. 280 mya
○ b. 250 mya
○ c. older than 280 mya
○ d. older than 530 mya
○ e. 100 mya

value: 10
what organisms gave rise to the lobe - finned fish?
○ a. mammals
○ b. birds
○ c. reptiles
○ d. amphibians
○ e. ray - finned fish

Explanation:

For the first question, according to the principle of superposition in geology, the lower rock layers are older. Since the fossil is on top of the 280 - mya and 250 - mya rock layers, it is younger than 250 mya.
For the second question, lobe - finned fish evolved from ray - finned fish.

Answer:

For the first question: b. 250 mya
For the second question: e. Ray - finned fish