Ano ang naging kondisyon pangkabuhayan sa maraming bansa sa daigdig na nagtulak sa mga ito na manakop ng ibang bansa?​

The lower respiratory system includes the a. lungs. b. esophogus. c. larynx. d. pharynx

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.

Exercise has no positive effects on the nervous system? true or falseu