which sentences are compound - complex sentences? check all that apply.\n□ your brain produces more dopamine…

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

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

Answer

Brief Explanations:

A compound - complex sentence has at least two independent clauses and at least one dependent clause.

  1. "Your brain produces more dopamine when it is engaged in solving a puzzle." has one independent clause "Your brain produces more dopamine" and one dependent clause "when it is engaged in solving a puzzle", so it is complex, not compound - complex.
  2. "Our brains produce a chemical known as dopamine that is involved in learning and in creating memories." has one independent clause "Our brains produce a chemical known as dopamine" and one relative clause (dependent) "that is involved in learning and in creating memories", so it is complex, not compound - complex.
  3. "We can put together a puzzle that has challenging shapes, or we can try to solve the sudoku in the newspaper." has two independent clauses "We can put together a puzzle that has challenging shapes" and "we can try to solve the sudoku in the newspaper" and one dependent clause "that has challenging shapes", so it is compound - complex.
  4. "Working on puzzles increases our concentration and can expand our creativity; puzzle - making even has health benefits." has two independent clauses "Working on puzzles increases our concentration and can expand our creativity" and "puzzle - making even has health benefits", but no dependent clause, so it is compound, not compound - complex.
  5. "Students can improve their performance when they are faced with a challenging task, but they will have to start doing jigsaw puzzles." has two independent clauses "Students can improve their performance" and "they will have to start doing jigsaw puzzles" and one dependent clause "when they are faced with a challenging task", so it is compound - complex.

Answer:

We can put together a puzzle that has challenging shapes, or we can try to solve the sudoku in the newspaper. Students can improve their performance when they are faced with a challenging task, but they will have to start doing jigsaw puzzles.