Chapter 20: Q.15 (page 504)
Which phylogenetic model proposes that all three domains of life evolved from a pool of primitive prokaryotes?
a. tree of life
b. web of life
c. ring of life
d. network model
Short Answer
Option : (c) ring of life.
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Chapter 20: Q.15 (page 504)
Which phylogenetic model proposes that all three domains of life evolved from a pool of primitive prokaryotes?
a. tree of life
b. web of life
c. ring of life
d. network model
Option : (c) ring of life.
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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?

Why is it so important for scientists to distinguish between homologous and analogous characteristics before building phylogenetic trees?
List the different levels of the taxonomic classification system.
Figure 20.11 What is the largest clade in this diagram?

What does the trunk of the classic phylogenetic tree represent?
a. single common ancestor
b. pool of ancestral organisms
c. new species
d. old species
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