Why would a Polar Bear's white fur and a Snowy Owl's white feathers not be good examples of homologous structures

Where in the body can you find chemoreceptors? a. on the skin and ears, to detect pressure, touch, motion, and sound b. on the retina, to detect a single photon of light c. on the skin, to detect temperature or specific chemicals d. on the tongue and in the nose, to detect taste or odor

What is the most appropriate method of gaining weight (muscle mass)

As an asteroid comes close to earth, it's name will change to? apex