The radula is indicated by letter
a. A.
b. B.
c. C.
d. D.
e. E.
Answer: a
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If the actual results most closely resembled those in part (A) in the figure above, then a further question arising from these data is:
"Do the Dawsonia rhizoids have to be alive to reduce soil nitrogen loss, or do dead rhizoids have the same effect?" Arrange the following steps in the correct sequence to test this hypothesis. 1. Add metabolic poison to the soil of the experimental plot of mosses. 2. Apply water equally to the experimental and control plots. 3. Measure initial soil nitrogen contents of control and experimental plots. 4. Determine nitrogen loss from soil of control and experimental plots. 5. Establish two identical plots of Dawsonia mosses; one as a control, the other as the experimental treatment. A) 5 ? 1 ? 3 ? 2 ? 4 B) 5 ? 2 ? 3 ?? 1 ? 4 C) 5 ? 3 ? 1 ?? 2 ? 4 D) 4 ? 5 ? 1 ? 3 ?? 2 E) 5 ? 3 ? 2 ?? 1 ? 4
Is natural selection the same thing as evolution?
A. Yes, they are the same because they both change populations. B. No, they are not the same because natural selection works on individuals, whereas evolution is change in populations. C. Yes, they are the same because they both involve phenotypes and genotypes. D. No, they are not the same because natural selection has never been observed.
An important bacterial mediated process that occurs on the surface of plant roots is called ________ nitrogen fixation.
What will be an ideal response?
Division of the cytoplasm in animal cells begins _____
a. as microtubules assemble at each pole of the nucleus b. as Golgi body vesicles are guided by microtubules to the center of the cell c. during S phase d. as rigid phospholipid bilayer is synthesized in between the dividing cells e. as a cleavage furrow is created by microfilaments in the cell's midsection