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.
It costs approximately 1,000 Baht ($30 USD) to spay or neuter one animal. This includes: 1  Drugs and surgical supplies. 2  Vets fees. 3  Nurse fee. 4  Dart and anaesthetic for catching.5  Dog catchers. 6  Vehicle costs and fuel. 7  Clinic overheads.t costs approximately 1,000 Baht ($30 USD) to spay or neuter one animal. This includes: 1  Drugs and surgical supplies. 2  Vets fees. 3  Nurse fee. 4  Dart and anaesthetic for catching.