Respuesta :
There were an increased number of land-based organisms in the Carboniferous period.
Correct answer choice is :
D) There were vertebrates with four legs in the Devonian period, but not in the Carboniferous.
Explanation:
The Earth has several distinct ecosystems, differing in temperature, moisture, light, and many other circumstances. Each of these habitats has different life forms living in it, making complicated communities of interdependent organisms. A complex community of plants and animals in a region and a climate is named a biome.