HELP MY SISTER WILL KILL ME! Warm air rising at the equator and cold air sinking at the poles is one reason for which type of movement of air?

conduction

radiation

convection currents

earth's rotation

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm

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.