What occurs when the surface of a large body of water is heated by the sun and the water at the depths remains cool because of lack of sunlight?
a halocline
a thermocline
a pycnocline
a halothermocline

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Which type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.