Whats the highest level of environmental organization?

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous

If a young male's body is just beginning the process of producing sperm, when is it likely that he would ejaculate mature, viable sperm"