The movement of gas into moist inter-cellular spaces through stomates in adaption for respiration in
a) protists
b) plants
c) grasshoppers
d) earthworms
e) none of the above

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.