21. Coxal glands a. are found in both arachnids and hexapods. b. are used in the

ID: 206752 • Letter: 2

Question

21. Coxal glands

a. are found in both arachnids and hexapods.

b. are used in the excretion of bile waste.

c. are most efficient in terrestrial environments.

d. Two of the above

e. None of the above

22. The Class Arachnida is characterized by

a. One pair of antennae, no mandibles, and six pairs of appendages.

b. No antennae, no mandibles, and six pairs of appendages.

c. No antennae, one pair of mandibles, and six pairs of appendages.

d. No antennae, no mandibles, and eight pairs of appendages.

e. None of the above

23. Reproductive isolation between two populations

a. defines the two populations as belonging to different species.

b. can occur after many generations of geographic separation.

c. can result because of behavioral differences.

d. Two of the above

e. All of the above

24. Natural selection occurs when

a. nature selects which organisms will survive and reproduce.

b. differential survival and reproduction has a genetic basis.

c. new traits arise in a population because of a changing environment.

d. Two of the above

e. All of the above

Coxal glands are found in arachnids.

They are used for excretion of bile.

Option b is the answer

Class Arachnida is characterized with members belong to chelicerates.

These lack mandibles, antennae and have six pairs of appendages.

Option b is the correct answer.

Reprodcutive isolation can occur once species separate from parent species and after many generations, isolation can be observed.

It can also result from behavior differences,

Option d is the answer

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