Question

The fact that we humans have the humerus, radius, ulna, femur, tibia, and fibula and the dogs and cats also have these bones indicate that these bones are homologous features. That is to say that these features were shared by the last common ancestor of humans, dogs, and cats.

a. True
b. False

Answer 1

Yes, the presence of similar bone structures in humans, dogs, and cats suggests they are homologous features, indicating a shared common ancestor.

Step-by-step explanation:

The fact that humans, dogs, and cats have similar bone structures, such as the humerus, radius, ulna, femur, tibia, and fibula, indeed indicates that these are homologous structures, implying a common ancestry. For organisms like humans, dogs, and cats which possess these long bones that function similarly as levers for movement, it is evident that the complexity of these structures suggests a shared evolutionary past rather than a coincidence. The similarity in the overall layout of these bones among different species is a result of them having evolved from a common ancestor. This common ancestry can also be traced in other mammals, like whales, whose flippers have different shapes and proportions, yet share the same basic skeletal structure.