a long time ago
Yes it is, and Liverworts were the first land plants.
Plants moved onto land after algae was entrapped in evaporating ponds, and cast up to the sea shore, and as a majority died, a few survived to be the plants we see on land today.
bryophytes
Yes they are
plants so the animals can have oxygen
Light energy to photosynthesize made it beneficial for aquatic plants to move onto land. Terrestrial environments allowed the plants to be able to absorb more sunlight in contrast to living beneath the surface of water.
It didn't. The ozone layer permitted plants and animals to move from the deep water to the water's surface, and eventually to land.
plants
The first plants with spores, which indicates that they were land plants, appeared in the Middle Ordovician period, about 470 million years ago. First records of tetrapods, or land animals, show up in the fossil record around 370 million years ago.
Algae are one of the oldest lineages, from before plants went onto land. Bryophytes are of the first lineage to live on land.
The development of a protected embryo .
1824