In a set of classic experiments performed in the ear;y 1950's, Urey and Miller subjected an experimental system composed of H2, CH4(methane), and NH3(amonia) to electrical sparks. A few days later, they found______ in their system.
According to the biological species concept, species are natural populations of organisms that have the potential to interbreed and are _______ isolated from othe such populations.
Populations of Larus gulls around the North Pole show an unusual pattern of reproductive isolation: each population is able to interbreed with its neighboring populations, but populations seperated by larger geographic distances are not able to interbreed. Larus gulls are an examle of a _____ species.
In the plant kingdom, all of the species are descended from a single common ancestor, In terms of phylogeny, what type of tree of life is this?
Phylogenetic trees should be viewed as:
Hypotheses regarding evolutionary relationships of groups of organisms.
The difference between microevolution and macroevolution is that:
They take place on different time scales.
The idea of punctuated equilibrium challenges which component of Darwin's theory of evolution?
Not steady change, gradualism, or species stasis.
Which of the following scenarios would best facilitate adaptive radiation?
A population of birds becomes stranded on an island archipelago.
The mass extinction that occured on earth 65v million years ago was immediately follwed by:
The rapid divergence and radiation of modern mammals.