Based on the dichotomous key, what type of tree did this leaf come from? Horse chestnut
Ginkgo
Honey Locust
Black maple

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Where in the cell are ribosomes made?

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.