Which Helminth group contains members without a digestive system?
A) Phylum Nematoda
B) Phylum Cestoda
C) Class Cestoda
D) Phylum Trematoda
C) Class Cestoda
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Examine the flux diagrams in Figure 25.6 to address the following questions. What is the difference in the rate of carbon exchange (in gigatons per year of carbon) between photosynthesis and respiration in the marine environment?
What will be an ideal response?
Cyanobacteria capable of fixing atmospheric N2 always produce heterocysts.
Answer the following statement true (T) or false (F)
Which one of the following does NOT apply to RNA?
A. It is a single strand. B. It contains the base uracil. C. The sugar is deoxyribose. D. It is involved in translation and transcription.
If you were using cladistics to construct a phylogeny of canines, which of the following would be the most useful outgroup?
a. Leopard b. Domestic dog c. Coyote d. Wolf e. Crocodile