The age of gymnosperms is known as the:

Which era is also known as the 'Age of Reptiles'?

The earliest reptiles evolved in which geological period?

The origin of seeds in land plants was achieved about $345 \; \text{million}$ years ago, in lineages recognized as ancestral to all more advanced vascular plants in:

The earliest fossil in the evolutionary history of the horse is......

Fish with stout and strong fins could move on land and go back to water. This occurred about ....... million years ago.