What do butterflies have on their feet which allows them to sense different strengths and types of nectar? a. mechanoreceptors b. acoustic receptors c. substratum receptors d. chemoreceptors

Air flows upward in the wick of a lantern because of the liquid property called

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j