1. Because water vapor molecules are lighter than nitrogen or oxygen molecules, a. Hot air rises
b. Air pressure is low at high altitudes
c. Humid air is lighter than an equal volume of dry air at the same temperature
d. Clouds form in cold fronts

Answers to mastering biology drag the labels to their appropriate locations to complete the punnett squares for morgan's reciprocal cross. drag blue labels onto the blue targets to indicate the genotypes of the parents and offspring. drag pink labels onto the pink targets to indicate the genetic makeup of the gametes (sperm and egg). labels can be used once, more than once, or not at all. hints