The dry tissue that no longer carries water and solutes is called ________.
A. Heartwood
B. Vascular cambium
C. Sapwood
D. Bark
E. Periderm
Answer: A. Heartwood
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How can scientists determine what atmospheric CO2 levels were like hundreds—or even thousands—of years ago? Select all that apply
A. They can examine ice core samples from Antarctica. B. They can examine CO2 levels in the outermost layer of Earth' atmosphere. C. They can examine the number of stomata in fossilized leaves. D. They can examine the number of fossilized dinosaur skeletons from different eras.
Why is it that mutation, acting alone, has little effect on allele frequency, and therefore evolution? What other factors will magnify the effect?
What will be an ideal response?
The lysogenic pathway is characterized by:
a. integration of viral DNA into the host chromosome b. extensive transcription of viral DNA c. release of phages d. host cell death e. no dormant stage
Humans, as well as all other mammals, have hair. Hair, then, would be considered to be a(n):
a. derived character. b. cladistic character.
c. ancestral character. d. analogous character. e. polyphyletic character.