Asmoker feels more relaxed after a cigarette partly because a. of an intense placebo effect b. blood pressure and heart rate has gone up c. muscle tone has been reduced d. gastrointestinal activity has been inhibited

typically, most spiders possess eight eyes. however, others have as many as 12, and some don't have any. these eyes are for detecting light from dark, deciphering shapes and for gathering their prey.

the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.