Which of the following undergoes change during a chemical reaction? a. atomic masses of elements in reactants b. element identities of atoms in reactants c. total number or electrons in reaction d. chemical bonds between atoms in reactants

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.