I think the correct answer from the choices listed above is option B. Yawning is a fixed action pattern type of innate behavior. This behavior is an instinctive behavioral sequence and it inevitably runs into completion which means it cannot be stopped. Hope this answers the question.
Antigen: is a a foreign substance or toxin that causes a immune response.
Antibody: it is a blood protein that is produced in response to an antigen.
White blood cell: also called a leukocyte and is a cell that counteracts against antigens.
Specific: If your're talking about the biology definition then it is, of or pertaining to a species.
Pathogen: a virus or bacteria that can cause a disease.
Answer:
Amber is the fossilized resin from ancient forests. Amber is not produced from tree sap, but rather from plant resin. This aromatic resin can drip from and ooze down trees, as well as fill internal fissures, trapping debris such as seeds, leaves, feathers and insects.
B. Earth rotates on a tilted axis
The seasons are created by the differences in proximity to the sun from the earth being tilted towards or away from the sun.
The repressor would no longer be able to bound back to DNA