What can scientists learn about fossils using techniques of absolute-age dating?

What is the sequence by which natural selection works?

Which type of fossil forms through carbonization?

Living species that are closely related share a common _____

How closely related two species are depends on when they _____, or split, from their common ancestor.

The study of similarities and differences among structures of living species is called _____

Body parts of organisms that are similar in position but different in function are called _____. The forelimbs of different mammals are examples.

If a species have homologous structures, this suggests that the species are ______

______ are body parts that perform a similar function but differ in structure. The wings of flies and birds are examples.

The existence of analogous structures indicates that the species are not ______ related.

Body parts that have lost their original function through evolution are called _____. The _____ of flightless birds are an example.

The best explantion for vestigial structures is that the species that have vestigial structures are _____ to ancestral species that still use the structures for a specific purpose.

Whales have a tiny _____ bone, which is a vestigial structure for walking on land.

Studying the developement of _____ can also provide scientists with evidence that certain species are related.

_____ is the study of the development of embryos from fertilization to birth.

All species of _____ have pharyngeal pouches at some stage during their development.

The similarities in location and function of the _____ is a sign that the vertibrate spacies share a common ancestor.

The study of gene structure and function is called _____

The existance of _____ provides evidence of evelution because they have been shown to be the source of variation upon which _____ acts.

The more closely related two species are, the more similar their _____ and _____ are.

Studies in molecular biology have shown that some stretches of _____ that are common tomany species change through time at steady, predictable rates like a kind of molecular clock.

Sceintists use this molecular clock to estimate the time in the past when living species _____ from common ancestors.

Scientific studies of fossils, anatomy, embryology, and molecular biology have provided evidence of relatedness among ______ and _____ species.

The continous discovery of new _____ that have features of species that lived before and after them is strong evidence of evolution of species.

Scientists today are studying how _____ can be reorginized in simple ways hat cause dramatic changes in organisms.

Though scientists now study evolution at the ______ level, the basic principles of Darwin's theory of evolution by natural selection have remained unchanged for more than ___ years