"Why do people think you need sunlight for plants."
Because that's how plants work.
"Plants grown on the ocean floor 5 miles down. It's documented."
No they don't and no it isn't. As far as I'm aware plant life does not exist below the photic zone of the ocean (about 200 meters or so down). There are animals that look like plants that survive below that region but they are not actual plants.
"Leitchen grows on the NORTH SIDE away from the sun."
Two words: ambient light.
"Mushrooms grow in caves."
Mushrooms are not plants, they're fungi. They do not need sunlight to survive, obviously.
"People need to read a science book."
One of us sure does.
"Science books have just as much fantasy as the Bible, only they have more respect among some people."
Science books with fantasy? Name one.
"Pluto was once considered, scientifically, to be a planet you know!"
It was not considered a planet "scientifically" as astronomers didn't have a firm definition of what a planet was. Essentially anything that had a reasonably close orbit to our sun and was "roundish" and had at least one satellite was a "planet." Unfortunately for that definition, more and more objects continued to be found that fit that definition and, so, a more solid definition was needed; one which Pluto failed to live up to.
"There's a book from Dr. Fred Hoyle that says so! It also says the Universe is in Steady State."
Hoyle was a bit of a dunce and the Steady State idea has been disproved since the late 1960s. Hoyle kept holding on to it because it was his pet theory seeing that he helped to propose it.