Mammals that have horns or antlers include deer, antelope, goats, and sheep. is it reasonable to conclude that the traits of horns evolved in a common ancestor of all these animals? Explain why.

Sheep, goats, antelopes, and deer are all members of the Order Artiodactyla, which is also known as even-toed ungulates. However, the deer branched off and evolved separately from sheep, goats, and antelopes. Deers are member of the family Cervidae, whereas sheep, goats and antelopes are from family Bovidae.

Therefore, these animals did not evolve from a common ancestor that has horns. Instead, they all evolved from a hoofed mammal. Moreover, the deer evolved from a cervid that has antlers, whereas, sheep, goats, and antelopes evolved from a bovid that has horns.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.