Suggest why red onion is often used when carrying out this investigation

Which of the following systems in absorbing oxygen and releases carbon dioxide

Read the scenario below and answer the question that follows. hallie is reading a novel in the library when susan, her best friend, slumps down in a chair next to her. susan doesn't say anything, but hallie knows that susan is upset because she is slumping in her seat and rolling her eyes. a psychologist would explain that hallie is interpreting her friend's emotion based on a. the behavioral component of emotion b. her friend's ability to regulate emotion c. the verbal component of emotion d. the physiological component of emotion select the best answer from the choices provided a b c d

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.