Which of the following describe glands? Check all that apply. a structure that secretes substances through a duct

a thin layer that separates or connects structures inside the body

a structure that secretes hormones into the bloodstream

a structure usually made from connective and epithelial cells

Select the correct answer. which phrase correctly describes temperature? o a. average rotational kinetic energy of the particles in an object o b. average energy of the particles in an object c. average translational kinetic energy of the particles in an object od. all energy possessed by the particles in an object

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.