I don’t know the gap at the beginning but the answer is c
The ratio is 9:52. Meaning there is 9 crabs in the tide pool compared to all other invertebrates in the tide pool (including crabs). Crabs are also probably higher on the food chain because there is less of them, meaning they require more food then the other invertebrates.
Hope this helps!
The answer is 8 it should be
Can you list the answer choices?

would be equivalent