A person who has a weakened immune system may not be able to fight against infection because.. pathogens may enter the body and cause illness.
phagocytes many enter the body and cause illness.
normal cells crowd out unhealthy cells.
of an increase in the production of antibodies.

Pathogens may enter the body and cause illness

Explanation:

With a weak immune system, response to any pathogens may be weak as well thus giving them great chance to entire the body and cause illness

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation: