The first animals to enter land were the invertebrates, followed by some fish which later evolved into amphibians.
If you mean animals as in insects (arthropods), they came in around the Devonian period of the Paleozoic era If you mean animals as in fish, amphibians etc then they came in at the same time as the arthropods
The first animals to successfully invade land were likely arthropods, such as early ancestors of insects, spiders, and scorpions. These creatures adapted to terrestrial environments by developing structures like jointed legs and exoskeletons to support themselves outside of water. They played a crucial role in the colonization of land and paving the way for subsequent terrestrial animal life.
invade
First were the plants and fungi, then came the arthropods, then finally the vertebrates.
Most evolutionary biologists theorize that the first living organisms were single-celled prokariotes similar to currently existing bacteria. The distinction between proto-biotic and true life is a difficult one, so while there were self-replicating amino acid chains, the first life would have been a distinct cell that divided in an aqueous (watery) environment. (see related link on abiogenesis)
there are many animals that invade other land. the main animals are mostly carnavors. the lions are one of them. lions invade other places to find food shelter and a place to keep there cubs safe. also wolves. wolves always want more land then they already own. they need room for there new pups and if another pack wants there land and takes over it. the other pack has to find new land and quick.
plants so the animals can have oxygen
Arthropods
yes
Land based animals first became common in the Paleozoic Era. It is the earliest era of the 3 in the Phanerozoic Eon.
Tamerlane invaded India, but he wasn't the first to invade. The first person to invade India was Shun Johan. So Shun Johan was the first to invade India.
the first invaders ever to invade rome was the huns!!