Question

the earths history has had a significant effect on the characteristics of its organisms and biomes. how was the carboniferous period different from the devonian period?
a. forests and land plants evolved during the carboniferous period.
b. there were vertebrates in the carboniferous period, but not in the devonian period.
c. there were an increased number of land - based organisms in the carboniferous period.
d. there were vertebrates with four legs in the devonian period, but not in the carboniferous.
please select the best answer from the choices provided

Explanation:

• Option a: Land plants evolved before the Carboniferous period. For example, during the Silurian - Devonian transition, early land plants like Cooksonia appeared. So this option is incorrect.
• Option b: Vertebrates (such as fish) were present in the Devonian period (the "Age of Fishes"). So this option is incorrect.
• Option c: The Carboniferous period is known for the expansion of coal - forming swamps and a significant increase in land - based organisms like large insects (e.g., Meganeura) and amphibians. In the Devonian, while there was an increase in land organisms (like early tetrapods), the Carboniferous had a more diverse and abundant land - based biota. This option is correct.
• Option d: Vertebrates with four legs (tetrapods) evolved in the Devonian and were also present in the Carboniferous. So this option is incorrect.

Answer:

C. There were an increased number of land - based organisms in the Carboniferous period.