16. opinion 17. fact 18. opinion
Https://www.popsci.com/ufo-aliens-military basically yes they do, its a fact all ufo means is unidentified flying object, it just means u dont know what it is, whether or not they are aliens is an entirely different matter, ufos are very well documented by credible sources, aliens not so much
Answer:
A. Bill's wife has positively reinforced him for bathing the dog.
Explanation:
Bill, having to clean up after dinner every night, likes to see it be cleaned and so if he goes to go do something and comes back and everthing is clean and he no longer has to do it, then it is safe to say that his wife is positively reinforcing him to clean the dog.
