A large bottle with a layer of mud on the bottom is filled with pond water. Several fish and some green plants are then added and the bottle is made airtight. The living and nonliving contents of this bottle make up
A biome
A population
А
B
с
An ecosystem
D
A species

Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?

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.

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from