Which of the following is an example of an aquatic community?
A. fishes, snails, crabs, water, and salinity
B. fishes, snails, and crabs only
C. both water and salinity
D. water only
E. salinity only
Ans: B. fishes, snails, and crabs only
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Within a gymnosperm megasporangium, what is the correct sequence in which the following should appear during development, assuming that fertilization occurs?
1. sporophyte embryo 2. female gametophyte 3. egg cell 4. megaspore A) 4 ? 2 ? 3 ? 1 B) 4 ? 1 ? 2 ? 3 C) 1 ? 4 ? 3 ? 2 D) 1 ? 4 ? 2 ? 3
Which of the following is true?
A. Only eukaryotes have a membrane-bound nucleus B. Only eukaryotes have ribosomes C. Only bacteria have cell walls D. Only bacteria and eukaryotes have a plasma membrane
Which Lophotrochozoan phylum includes members called ribbon worms or proboscis worms, which are found mostly in marine environments?
a. Rotifera b. Nemertea c. Platyhelminthes d. Mollusca
What is the normal pH of blood?
A. extremely acidic B. neutral C. slightly acidic D. extremely basic E. slightly basic