Explain why the reptiles are represented by more than one evolutionary lineage.

Discuss the timeline of the evolution of mammals .

Name the two groups of nonvertebrate chordates.

While amphibians have rudimentary lungs, skin is also a respiratory organ. Why would a thin skin be more sensitive to pollution than lungs?

A certain tennis player makes a successful first serve 70% of the time. Assume that each serve is independent of the others. If she serves 6 times, what's the probability she gets at least 4 serves in?

Name the two groups of nonvertebrate chordates.

Choose the best answer.

Adult sea squirts

a. do not have all five chordate characteristics.

b. are also called tunicates.

c. are fishlike in appearance.

d. are the first chordates to be terrestrial.

e. All of these are correct.

A major difference between birds and other reptiles is that birds
a. produce a shelled egg. $\hspace{2cm}$d. care for their young.
b. are ectotherms. $\hspace{2.9cm}$e. have air sacs.
c. are tetrapods.

Describe the many forms of leaf diversity.

Identify the anatomical structures of a woody twig.

Identify the three types of tissue found in angiosperms.

The first mammals to evolve were
a. aquatic. $\hspace{3cm}$d. placental.
b. marsupials. $\hspace{2.5cm}$e. primates.
c. monotremes.

Choose the best answer.

Which of these is a true statement?

a. In all mammals, offspring develop completely within the female.

b. All mammals have hair and mammary glands.

c. All mammals have one birth at a time.

d. All mammals are land-dwelling forms.

e. All of these are true.

A major difference between birds and other reptiles is that birds
a. produce a shelled egg. $\hspace{2cm}$d. care for their young.
b. are ectotherms. $\hspace{2.9cm}$e. have air sacs.
c. are tetrapods.