I’n pretty sure the answer is supposed to be about the tectonic plates. The plates constantly shift the land creating holes/dips in the earth and mountains in other places.
The antigen-binding sites of an antibody molecule are formed from the molecule's variable regions which are described as so because their amino acid sequences can be different on different antibodies.
The specificity of antibodies is determined by the variable regions found at their endpoints. Antibodies are specialized proteins secreted by B-cells of the immune system. They are also called immunoglobulins. They contain four polypeptide chains that comprise two heavy chains and two light chains to form a Y-shaped molecule.
The variable regions, more specifically the hypervariable regions of an antibody, have a high ratio of different amino acids with the most common amino acids provided in one place. The variable region serves as the antigen-binding site while the constant region found below the variable region is determined to invade the antigen.
Antibodies are preserved in our body to identify the antigen the next time it encounters. They send the signals to the other body parts to reject the antigen and invade it.
To know more about variable regions of antibodies, refer to the following link:
brainly.com/question/17439586
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Manuel Roxas, (born Jan. 1, 1892, Capiz, Phil.—died April 15, 1948, Clark Field, Pampanga), political leader and first president (1946–48) of the independent Republic of the Philippines.
After studying law at the University of the Philippines, near Manila, Roxas began his political career in 1917 as a member of the municipal council of Capiz (renamed Roxas in 1949). He was governor of the province of Capiz in 1919–21 and was then elected to the Philippine House of Representatives, subsequently serving as Speaker of the House and a member of the Council of State. In 1923 he and Manuel Quezon, the president of the Senate, resigned in protest from the Council of State when the U.S. governor-general (Leonard Wood) began vetoing bills passed by the Philippine legislature. In 1932 Roxas and Sergio Osmeña, the Nacionalista Party leader, led the Philippine Independence Mission to Washington, D.C., where they influenced the passage of the Hare-Hawes-Cutting Act. Roxas was later opposed by Quezon, who held that the act compromised future Philippine independence; the Nacionalista Party was split between them on this issue.
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