The primary advantage of gills versus the body surface for gas exchange in aquatic animals is that ________.
A. gills are located near the mouth
B. gills have a much greater diffusion surface area
C. gills decrease resistance to movement
D. all gills contain a countercurrent exchange system
B. gills have a much greater diffusion surface area
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Which of the following animals is not oviparous?
A. All of these animals are oviparous. B. a frog C. a platypus D. an owl E. a crocodile
How can an allele that confers no selective advantage spread through a population?
What will be an ideal response?
Crossing over is one of the most important events in
meiosis because a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. all of these reasons are true.
The basic conceptual approach to phylogenetic tree building involves the process of:
a. selecting information about character states. b. selecting taxa for inclusion in the tree. c. the logic that species with many character states in common are more closely related than those without. d. None of the above. e. All of the above.