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.
Tying the final knot in your shoelaces. Cross the middle of the black loop (âbunny earâ) over the middle of the red loop (âbunny earâ). Take the top of the red loop (âbunny earâ) and put it over the black loop (âbunny earâ). Now poke it through the cross or hole. Put your fingers inside the ends of the loops (âbunny earsâ), then hold on and pull tight. Youâve now tied the loops in a knot. Your shoelaces are tied.