Which sentence contains an inappropriate shift in tense?
a. sometimes the dog runs around and chases its own tail.
b. as the children play, jonah is happy to relax with a book.
c. lauren laughed out loud after she listens to joke.

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood