The answer is B, a team of explorers are studying the ocean floor
1. Identical twins are more likely to have roughly equal intelligence levels than fraternal twins.
2. "<span>Overall, the test scores of the identical twins were much closer together than those of the pairs of fraternal twins."
</span><span>"Ten pairs were identical twins, both developing from the same egg in their mother. The other ten pairs were fraternal twins."
The paragraphs compare the two, but show that it builds to that conclusion by showing those details. These seem like opening paragraphs too, so the final sentence would be the thesis statement. The thesis statement normally tells the reader the author's claim, so those two quotes I pointed out are its supporting details.</span>
Run-on sentences make text more difficult to read.
Run-on sentences can change the intended meaning of a text.
Run-on sentences can make a sentence confusing.
Overall, run-on sentences are just a bad idea.
