Is the biochemical phenomenon, occurring after continual exposure to an odorant, whereby receptors stop responding to an odorant and detection ceases. a. anosmia b. cross-adaptation c. cognitive habituation d. receptor adaptation e. odor repression

Receptor adaptation occurs when a sensory neuron has stopped sending impulses even though the original stimulus is still present. The answer is letter B. Receptor adaptation, the biochemical phenomenon, occurring after continual exposure to an odorant, whereby receptors stop responding to an odorant and detection ceases.  

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

i am going to guess that it is co2.