Corrected Sentence:
"Cats are easier to care for than dogs because they are very independent."
Explanation:
* "They" is the correct pronoun to refer to cats in this context.
* The original sentence used "very" instead of "they" which is grammatically incorrect.
* Also, "than" requires a comparison, so the sentence needs to be completed by comparing cats to dogs.
Here's why the original sentence is wrong:
* "Very" is an adverb and cannot be used to replace a pronoun.
* "Than" requires a comparison between two things. In the original sentence, it is unclear what "very independent" is being compared to.