The respiratory systems of fishes, frogs, sponges, and earthworms are similar in that they
A) exchange gases across a moist respiratory surface.
B) have internal respiratory structures.
C) utilize a complex network of air-conducting tubes.
D) employ an extensive system of air sacs that ensures a unidirectional flow of air.
E) have a countercurrent exchange system.
A
You might also like to view...
Media that can be used for isolating Bacillus anthracis include:
a. Thayer-Martin agar. b. 5% sheep blood agar. c. MacConkey agar. d. Columbia blood agar with colis-tin-nalidixic acid (CNA).
The different tRNAs are produced by
A) different aminoacyl-tRNA synthetases that produce tRNAs from ribonucleotides in the cytoplasm. B) RNA editing of transcripts of a single tRNA gene. C) alternatively spliced of a single tRNA gene. D) transcription of different tRNA genes in the genome.
A common consequence of nutrient deficiencies in plants is chlorosis. What is chlorosis?
a. It is death of the growing tips. b. It is premature loss of leaves. c. It is bursting of cells from excess water uptake due to an inability to clear chlorine from them. d. It is yellowing of plant tissues due to a lack of chlorophyll.
Blue-footed boobies of the Galapagos will mate only after a very specific courtship display on the part of the male. He high-steps to advertise his bright blue feet. What isolating mechanism discourages mating outside the species?
A) gametic isolation B) temporal isolation C) ecological isolation D) behavioral isolation