Mr. Chorma's science class built an electromagnet with a metal rod, a wire, and a battery. They day they built it, the electromagnet worked. The next day it did not work. What is the best explanation as to why the electromagnet did not work?
A
The battery was drained.

B
The battery wouldn't conduct electricity.

C
The circuit was closed.

D
The wire wouldn't conduct electricity.

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.

Which of the following human activities resulted in the growth of the north american deer population?

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review