Which body system is primarily responsible for protecting against foreign substances and disease-causing organisms?

The answer is immune system. The immune system is the body's protection against infectious organisms and other attackers. Through a series of steps called the immune response, the immune system attacks organisms and substances that invade body systems and cause disease.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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