Why do some marine scientists specialize in single-celled organisms? a) There are very few species to choose from.

b) Single-celled organisms are the least understood in the ocean.
c)
Many of them are poisonous, so they endanger other creatures.

d) Single-celled organisms form the foundation of life in the ocean.​

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

Models are non-visual ways of coummincating how someone thinks about something in the natural world

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.