system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can scientists confidently say we've only discovered 14% of all living species?

Are there a finite number of species? If we've discovered roughly 8 million, are there only about 75 million species on Earth? How can scientists know there are that many species on Earth but not know all of those species?
gpt
It’s a general hypothesis that only so many *could* fit on the earth, so that being said, a rough estimate can be made about a conservative max number of living organisms on the planet. It’s basically like knowing the dimensions of your new bedroom, and by placing your bed in there you can roughly estimate the amount of other furniture that will fit in there without it being unreasonably crowded.