Echidnas are marsupial mammals that have quills all over their body and look like placental hedgehogs. The two are not closely related. Echidnas are found in Australia and hedgehogs are found in Europe, Asia and Africa. Their resemblance is a result of which of the following? a. Adaptive radiation
b. Convergent evolution
c. Disruptive selection
d. Homologous features
e. Sympatric speciation

How is the carbon cycle related to global warming ?

One of the newest applications of cell technology is called cybrid embryos. this process involves replacing the nuclear material of an animal cell with human nuclear material. how might this process affect public policies about research by using stem cells? the same policies and concerns about the use of human embryonic stem cells would most likely apply. the embryos would most likely be treated like traditional animal embryos and regulated accordingly. the process of forming cybrid embryos would most likely be banned by government regulators. the embryos would be treated as regular cells because they are not fully human in origin.

What organs comprise the respiratory system of a bird