No change was seen; it's much too soon.
Some slight increase of bristle numbers was already evident.
A vast, overlapping range of bristle numbers was seen.
A slight increase in bristles in S, a slight decrease in R, with a little overlap in the middle ranges.
A huge increase in S, a huge decrease in R, with no overlap whatsoever.
Absolutely no data to prove or disprove the theory of evolution.
It takes thousands to millions of generations to see evolutionary change, if at all.
Dramatic variation may be present within a population, but may not be observable unless strong selection occurs.
Dramatic mutations may occur within a population under strong selection.
Although evolutionary change was observed, this would not be expected in higher organisms such as mice.
To the available food supply.
To the available nest building material supplies.
To the availability of potential mating partners.
To presence of ectoparasites on their feathers.
To the need to improve their feather preening abilities.
Successive rock layering.
Radioactive isotope decay.
Referred to as successive homologies.
Referred to as descent.
Also known as natural selection.
A variety of homologous structures.
A variety of phenotypes.
A variety of mutations.
A variety of analogous breeds.
Many different species.
A rock contains 18 mg of the radioactive isotope carbon-14. The half-life of carbon-14 is 5,600 years. How many half-lives and years will it take before the carbon-14 decays to less than 4 mg? A. 1 half-lives; 5,600 years B. 2 half-lives; 11,200 years C. 3 half-lives; 16,800 years D. 4 half-lives; 22,400 years E. 9 half-lives; 50,400 years A rock contains 18 mg of the radioactive isotope carbon-14. The half-life of carbon-14 is 5,600 years. How many half-lives and years will it take before the carbon-14 decays to less than 4 mg? A. 1 half-lives; 5,600 years B. 2 half-lives; 11,200 years C. 3 half-lives; 16,800 years D. 4 half-lives; 22,400 years E. 9 half-lives; 50,400 years the color change induced by living in industrialized areas.
The darker moths having higher mutation rates because of industrialization.
the evolutionary process in which initially light-colored organisms become dark as a result of natural selection.
The darker moths having higher reproductive success because of their pigmentation.
The widespread implementation of pollution controls.
Can be dated only with one layer in relation to older layers below and younger layers above, no actual dates can be estimated.
Can be dated reasonably well only with uranium-238.
Can be dated reasonably well using a variety of radioactive isotopes with known half-lives.
Can be dated precisely, to within a single year, using radioactive isotopes.
Can be dated precisely, to within a single year, using DNA hybridization.
They are more cryptic.
Of migration from more polluted areas.
Of directional mutation.
They were preyed on more.
Of a bottleneck effect.
Beaks of finches.
The fossil record.
The molecular record.
Patterns of distribution
Alterations of DNA sequences.
Modifications of the environment.
Shows they evolved from fish.
Shows they evolved from swimming dinosaurs.
Shows they evolved from a land mammal with hooves.
Has fragmentary evidence that cannot be explained.
Has no evidence about how they evolved.
Lanugo; fine fur during development
Gill slits during development
Long bony tail during development