GEOLOGY

Detailed explanation-1: -Insects appeared on the continents, which were covered in giant ferns. The first amphibians, such as the ichthyostega, also moved out of the water.

Detailed explanation-2: -The earliest well-known amphibian, Ichthyostega, was found in Late Devonian deposits in Greenland, dating back about 363 million years.

Detailed explanation-3: -The First Animals Sponges were among the earliest animals. While chemical compounds from sponges are preserved in rocks as old as 700 million years, molecular evidence points to sponges developing even earlier.

Detailed explanation-4: -The earliest vertebrates on land existed 350 million years ago and were large amphibious piscivores, through gradual evolutionary change, insectivory was the next diet type to evolve. Insects were among the earliest terrestrial herbivores and acted as major selection agents on plants.

Detailed explanation-5: -Amphibians were not the first tetrapods, but as a group they diverged from the stock that would soon, in a paleontological sense, become the amniotes and the ancestors of modern reptiles and amphibians. Tetrapods are descendants from a group of sarcopterygian (lobe-finned) fishes.