Answer

Which sentences are compound-complex sentences? Check all that apply. Your brain produces more dopamine when it is engaged in solving a puzzle. Our brains produce a chemical known as dopamine that is involved in learning and in creating memories. We can put together a puzzle that has challenging shapes, or we can try to solve the sudoku in the newspaper. Working on puzzles increases our concentration and can expand our creativity; puzzle-making even has health benefits. Students can improve their performance when they are faced with a challenging task, but they will have to start doing jigsaw puzzles