Im sure the correct answer is D: Heart, stomach, lungs and liver.
<span>"How does Twitter affect the safety and security of teenagers?" Would be the best answer because it is the only one which is answered in the text. :)</span>
Answer:
An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.
Explanation:
GOT THIS FORM GOOGLE OK HOPE IT HELPS:)
C. Because Adequate sleep is as important to fitness as exercise and healthy eating!
Sleep affects just about everything you do
