If a bat, a human, an alligator, and a penguin all evolved from a common ancestor, then they should share common anatomical traits. In fact, they do. Compare the forelimbs of the human, the bat, the penguin, and the alligator. Find the humerus, radius, ulna, and carpals in each forelimb. Though the limbs look strikingly different on the outside and though they vary in function, they are very similar in skeletal structure. More significantly, they are derived from the same structures in the embryo. Structures that are embryologically similar, but have different functions, are called homologous structures. Though these animals look different, a comparison of homologous structures indicates that they are quite similar. This suggests that these animals evolved from a common ancestor.
by: Lameace[=
The presence of homologous structures (for example, the bone structure in chimpanzee arms, human arms, and whale flippers) indicates that the species sharing that homologous structure share a common ancestor.
homologous structures
this question is to hard cant find it
Examples of Homologous Structure: Rodent teeth Hooves in species of camels, goats, sheep and cattle Hands and feet in primates Bird feathers Shark morphology
homologous
A homologous structure is an example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor.
The human appendix (a small sac near the junction of the small and large intestine) is homologous to a structure called the "caecum", a large, blind chamber in which leaves and grasses are digested in many other mammals.http://scienceline.ucsb.edu/getkey.php?key=3246
I learned about homologous and heterozygous structures in Biology.
A structure with similar shape but a different use
Two samples are said to homologous, in this context, when they are both very similar in structure and shape and more than likely function.
A structure with similar shape but a different use
A homologous structure is a structure found in two very different animals that has a similar form in both animals. For example, the bones of a human hand are homologous to the bones in a bat's wing or a whale's flipper. Structures that appear very similar suggest that two animal may be related, as in humans, bats, and whales, which are all mammals.