Describe what kinds of information can be learned from a single fossil, including information about the organism and its environment.

Cite specific examples of how data from molecular systematics have confirmed or modified traditional animal phylogeny and identify the three major clades of bilateral animals.

Figure 20.6 At what levels are cats and dogs considered part of the same group?

Which statement about the taxonomic classification system is correct? There are more domains than kingdoms Kingdoms are the top category of classification Classes are divisions of orders Subspecies are the most specific category of classification.

What is used to determine phylogeny? mutations DNA evolutionary history organisms on earth

Which category falls immediately below class in the systematic hierarchy? a. species b. order c. family d. genus e. phylum

Figure 20.10 Which animals in this figure belong to a clade that includes animals with hair? Which evolved first, hair or the amniotic egg?

What is the difference between micro- and macroevolution? Microevolution describes the evolution of small organisms, such as insects, while macroevolution describes the evolution of large organisms, like people and elephants Microevolution describes the evolution of microscopic entities, such as molecules and proteins, while macroevolution describes the evolution of whole organisms Microevolution describes the evolution of organisms in populations, while macroevolution describes the evolution of species over long periods of time Microevolution describes the evolution of organisms over their lifetimes, while macroevolution describes the evolution of organisms over multiple generations.

Which of the following statements about evolutionary studies is not true? a. Biologists study the products of evolution to understand the processes causing it. b. Biologists design molecular experiments to examine evolutionary processes operating over short time periods. c. Biologists study the inheritance of characteristics that a parent acquired during its lifetime. d. Biologists study variation in homologous structures among related organisms. e. Biologists examine why a huge variety of species may inhabit a small island cluster.

What type of data is primarily used to determine the existence and appearance of early animal species? molecular data fossil data morphological data embryological development data