Biology (Holt)
Evolution by Natural Selection Darwin realized that Malthus’s hypotheses about human populations apply to all species. Every org ...
Darwin’s Theory Darwin’s book On the Origin of Species by Means of Natural Selection appeared in November of 1859. Many people w ...
Darwin’s Ideas Updated Since the time Darwin’s work was published, his hypothesis—that natural selection explains how evolution ...
The Tempo of Evolution For decades, most biologists have understood evolution as a gradu- al process that occurs continuously. T ...
The Fossil Record Have you ever looked at a series of maps that show how a city has grown? Buildings and streets are added, chan ...
Formation of Fossils The fossil record, and thus the record of the evolution of life, is not complete. Many species have lived i ...
the bodies of some organisms decay faster than others do. For example, an animal with a hard exoskeleton (such as a crab) would ...
Anatomy and Development Comparisons of the anatomy of different types of organisms often reveal basic similarities in body struc ...
Biological Molecules The picture of successive change seen in the fossil record allows sci- entists to make a prediction that ca ...
Section 3 Examples of Evolution 288 CHAPTER 13The Theory of Evolution Natural Selection at Work How does evolution occur? The he ...
Example of Natural Selection The lung disease tuberculosis (TB) is usually caused by the bac- terium Mycobacterium tuberculosis, ...
Evolution in Darwin’s Finches Darwin collected 31 specimens of finches from three islands when he visited the Galápagos Islands. ...
Formation of New Species Species formation occurs in stages. Recall that natural selection favors changes that increase reproduc ...
There are several types of barriers that may isolate two or more closely related groups. For example, groups may be geographical ...
CHAPTER 13 Highlights 293 Key Concepts Study CHAPTER HIGHLIGHTS ZONE Key Terms Section 1 population (278) natural selection (279 ...
Using Key Terms 1.The process by which a species becomes better adapted to its environment is called a.gradualism. b.adaptation. ...
Use the diagram below and your knowledge of science to answer questions 1–3. 1.The diagram implies that warbler finches and arma ...
Before You Begin occurs when organisms that have certain survive to reproduce more than organisms that lack those traits do. A p ...
2.Tape one loop 3 cm from each end of the straw, as shown above. Mark the front end of the bird with a felt-tip marker. This bir ...
Desert organismsDesert organisms ...
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