While the trichromatic theory makes clear some of the processes involved in how we see color, it does not explain all aspects of color vision. The opponent-process theory of color vision was developed by Ewald Hering, who noted that there are some color combinations that people simply never see. For example, while we often see greenish-blue or blueish-reds, we do not see reddish-green or yellowish-blue.
Spay and Neuter Average Costs. The average costs of a spay or neutering procedure is $100 or $ 150. However, the costs of the surgery may be anywhere between $50 and $500.The price may depend on several factors including: 1  The method used for the spaying; presently there are 2 methods employed: the traditional method using a scalpel and the laser beam procedure. The method used for the spaying; presently there are 2 methods employed: the traditional method using a scalpel and the laser beam procedure. 2  The laser neutering procedure is costlier than the traditional surgery. 3  The location of the clinic may also be a factor that influences the costs.
The cost depends a lot on where you go. Some shelters and low cost clinics will spay and neuter for as low as $50 or less. Other veterinary hospitals will likely charge you around $200 (give or take) for a canine neuter, and $50-100 more for a spay (as it's a more complicated procedure than a neuter).ome shelters and low cost clinics will spay and neuter for as low as $50 or less. Other veterinary hospitals will likely charge you around $200 (give or take) for a canine neuter, and $50-100 more for a spay (as it's a more complicated procedure than a neuter).