Rheumatoid arthritis is caused by the release of enzymes by a certain organelle into the joints, which then digests the surrounding tissue and causes the subject pain. which organelle is probably the culprit

Lysosomes are the organelles responsible for this behavior.  They contain enzymes that breakdown biological polymers such as proteins, nucleic acids, carbohydrates and lipids. When the enzymes are released to the joints, they digest the tissues and cause pain. Rheumatoid arthritis is an autoimmune disease which means that the immune system responds in opposition to its own healthy cells. 

if you know your abc's you should be able to get your answer or just use google

wegner's theory did not explain how the continents could move

explanation: