Which will cause allergies if you inhale them, eat them, or touch them? antihistamines bacteria allergens antibodies

The only thing here that is capable of causing allergies is an allergen. Hence the name, it stimulates an immune response to a harmless antigen.

An antihistamine is a substance the prevents the swelling of certain areas of the body due to an increase in histamine production in that area.

An antibody is a type of white blood cell that fights disease.

Bacteria are microscopic organisms that are capable of doing a variety of different things, none of which are pertinent to your question.

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c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

the answer is a) cell division.

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