Foreign proteins that gain access to the body through cuts and scrapes, through the digestive or circulatory systems, or through the urinary and reproductive systems are called
1. mineralocorticoids
2. immunoglobulins
3. antigens
4. antibodies

option 3) antigens

Explanation:

An Antigen is any FOREIGN substance that can enters the body stimulating an immune response. It includes toxins, proteins etc, and can get into the body through ANY openings.

Therefore, antigen is the right answer

ok

explanation:

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.