The answer is d. you will recognize that heart tissue is tightly compacted and striated to allow the heart to beat, etc....
Explanation:
There are several types of antibodies and antigens, and each antibody is capable of binding only to a specific antigen. ... Antigens are bound to antibodies through weak and noncovalent interactions such as electrostatic interactions, hydrogen bonds, Van der Waals forces, and hydrophobic interactions.
Antibodies attach to a specific antigen and make it easier for the immune cells to destroy the antigen. T lymphocytes attack antigens directly and help control the immune response. They also release chemicals, known as cytokines, which control the entire immune response.
Pavlov's dog stopped salivating to the bell when the food was no longer paired with the bell. This is called:
extinction
