John is a nine-year-old boy. As a growing boy, he is undergoing many changes. Classify the various changes that John is experiencing as social and emotional, physical, or cognitive. body produces increased testosterone concerned about appearance started understanding abstract concepts sweats more attracted to opposite gender PLEASE HELP ASAP!!!

Which of the following is a nonspecific defense against pathogens? - b cells - antibodies - t-cells - inflammation

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

Explain why methicillin resistant staphlococcus aureus (mrsa) is more prevalent now than it was only 30 years ago. a. antibiotics cause mutations in staphlococcus aureus that lead to an increase in the number of methicillin-resistant strains. b. methicillin resistance causes an infection to spread more rapidly.c. frequent and inappropriate use of methicillin-type antibiotics has provided selective pressure that has resulted in an increase in the proportion of methicillin-resistant strains of staphlococcus aureus.d. diseases like aids have made people more vulnerable to infections from staphlococcus aureus.