What do bryophytes lack that make them less likely to have formed fossils?
a. Chlorophyll
b. Lignin
c. Deep roots
d. Special cells that conduct fluids
b. Lignin
Bryophytes lack lignin—the tough polymer found in the cell walls of vascular plants—that makes them less likely to have formed fossils. They do lack the special cells that conduct fluids in vascular plants, but these cells do not directly affect their likelihood to form fossils.
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Microevolution can be said to have taken place when
a. a population experiences a shift in allele frequencies. b. a mutation occurs in a population. c. several mutations occur in a population. d. a feature of an individual animal changes through use or disuse. e. when a population has different forms of the same gene.
Ferns, roots, and fronds grow from __________. Fill in the blank(s) with the appropriate word(s)
Which of the following is not a unicellular eukaryote?
a. Saccharomyces cerevisiae b. Amoeba proteus c. Archaebacteria d. Dictyostelium discoideum
In a maple forest in the spring, the ground is often covered with young maple seedlings, which compete for light and nutrients. By fall, most of the seedlings have died, leaving only a few survivors
This is an example of ________ life history pattern. Fill in the blank(s) with correct word