Primary succession occurs when pioneer species move into an area that has no plants. Which organisms are common pioneer species? O Conifer trees and tall grasses with roots that loosen the soil
O Mosses and lichens that can grow on rocky surfaces
O Grasses and weeds that arrive as seeds carried by the wind and then germinate in rich soil
O Vines and shrubs that help prevent the erosion of shallow soil

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.