They were the first species to develop mesoderm. That mesoderm tissue develops into organs and muscles as the organism grows. They also have simple nervous systems and sensory organs. While they don't have a respiratory system or circulatory system to speak of, they do have a neat little digestive system. Most species of flatworms have no anus and a cavity with only one opening. While not all species do, many flatworm species use a mouth to eat. The only problem with no anus is that the stuff you don't digest has to go out the mouth when you're done. Other materials that need to be removed from the system can be excreted through specialized cells called flame cells. Flame cells are the first appearance of excretory ducts in organisms. Flame.
1 Some clinics and animal hospitals can charge up to $200-$300 or more, depending on the weight of the dog. 2  The cost of both neutering and spaying vary greatly by geographic region, and even by veterinarian. But lower cost sometimes means an assembly-line approach is used, so the dog might not get as much attention or recovery time. 2  Spay/USA has a referral service for reduced cost spay and neuter clinics. 3  In rare cases, such as with programs that use veterinary students, spaying and neutering can be free.
We have a low-cost spay/neuter clinic in the Atlanta area and we spay dogs for as little as $70. The ASPCA keeps a database of low-cost options on its web site. You can put in your zip code, and it will give you all your options within a certain radius. Click on the âpet careâ tab and look for the low-cost and free spay/neuter database. Q: Donât dogs get fat once you spay or neuter them? A: Dogs, just like people, get fat when they eat too much and donât get enough exercise. And thatâs something you can control. You can use portion control and take your dog for a walk. Q: My dog is a guard dog. If I spay or neuter him, will that stop him from protecting my house?