21. During a lab in her Biology class at Jamul High School, Romilda set up an experiment testing the effects of running on production of carbon dioxide. She decided to only use female students between the ages of 14 – 17. All of the female students also needed to weigh between 85 – 105 pounds and measure between 22% - 32% body fat. Half of the female students will not run, while the other half will run for 25 minutes every day for 30 days.

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen