the answer is A) (rolling hills is widespread in both northen and southern europe)
I believe it's newton's third law. For every action(force) , there's an equal and opposite reaction.
Answer:
Seasonal discount
Explanation:
A seasonal discount is a discount that has been put on the goods out of the season so when people purchase it they get a huge discount. In this discount, the prices of a product get reduce the people who can purchase the same thing at a low price. This is also called a seasonal promotion. In this discount procedure, people get a discount on brands and varieties. In the fashion industry, the retailers offer a discount on summer clothes when summers nearby end and offer winter clothes when winters are at the end.
I'd say either railroads or wagon trains because airplanes and steamboats are not land travel and wagon trains are a vehicle and railroads are a thing they ride on to guide them
The antigen's foreignness is the most important determinant of immunogenicity when considering an antigen.
An antigen in immunology is a molecule, molecular structure, foreign particle, pollen grain, etc. that may attach to a particular antibody or T-cell receptor. Antigens within the body may cause an immunological response.
Antigens are outside elements. Normally, the body's defence cells don't react to molecules that belong to it (self antigen). A substance's antigenicity is often correlated with its foreignness . When compared to antigen from other members of the same species, it is less antigenic.
A foreign substance must make up the immunogen. Only substances that are not normally found in the body or exposed to the cells of the particular immune system trigger immune reactions. The immune system will distinguish between "self" and "non-self" in normal circumstances.
To learn more about antigen, refer from
brainly.com/question/15694610
#SPJ4
