Answers: 1.Circulatory system-pumping blood to and from the body and lungs with the heart 2.Digestive system-digestion and processing food with salivary glands, esophagus, stomach, liver, gallbladder, pancreas, intestines, rectum, and anus.
During the tie, the male turns around so the dogs are back to back and can defend themselves. The tie typically lasts 20 to 40 minutes. It may be just a few minutes, and dogs can mate successfully without becoming tied at all. The evolutionary reason for the tie is unknown, but it's assumed that if a male dog is tied to a female, it prevents other males mating with her. Unwanted Mating.
How to Tie a Taut Line Hitch Knot. You will need. Step 1 Make Q shape Cross the end of the rope over the top of the remaining rope, making a âQâ shape. Step 2 Tuck end through loop Tuck the end of the rope, or the tail of the âQ,â up through the loop from behind. Step 3 Tighten Pull the rope at both ends to tighten. The easiest stopper knot to tie, the Overhand is used to keep a rope from slipping out of a hole through which it has been threaded.