"First plant on Earth its thought" NYT crossword answer is:
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The first plant on Earth is believed to have been a type of green algae known as charophytes. These ancient organisms were the ancestors of modern plants, and they are thought to have evolved around 500 million years ago. Charophytes were the first organisms to move onto land, and they are credited with helping to create the oxygen-rich atmosphere that allowed more complex life forms to evolve. They are also thought to have been the first organisms to produce lignin, a key component of plant cell walls.