A diverse array of seedless plants still populate and thrive in the world today, particularly in moist environments.
The geologic periods of the Paleozoic are marked by changes in the plant life that inhabited the earth.
Plants adapted to the dehydrating land environment through the development of new physical structures and reproductive mechanisms.
Sporophytes (2n) undergo meiosis to produce spores that develop into gametophytes (1n) which undergo mitosis.
Plants developed a series of organs and structures to facilitate life on dry land independent from a constant source of water.
Land plants, or embryophytes, are classified by the presence or absence of vascular tissue and how they reproduce (with or without seeds).