occurs as airborne molecules pass over five million nerve fibers with the receptor proteins on the surface of these fibers being stimulated by these molecules, causing signals to be sent to the brain.

Hearing

Touch

Smell

Taste

All these senses can occur as airborne molecules pass over five million nerve fibers with the receptor proteins on the surface of these fibers being stimulated by these molecules, causing signals to be sent to the brain.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.