If you saw a vascular plant that was growing low to the ground with branching stems covered by small leaves in a helical pattern and that produced spores on leaves, you are most likely observing a(n):
A. fern.
B. horsetail.
C. gymnosperm.
D. angiosperm.
E. lycophyte.
E
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The unique antigenic determinants of the 90 serotypes of Streptococcus pneumoniae are found
A) on the cell-surface M proteins. B) on the capsular polysaccharides. C) in the bacterial cell wall. D) in the inclusions in the periplasmic space.
Apples that we find in the grocery store today are much larger and sweeter than those found in the wild hundreds of years ago. Which process is responsible for this change?
A. Resistance to pesticides B. Artificial selection C. Genetic drift D. Survival of the fittest
flowchart
11. Chemical evolution started on Earth ____. a. after the appearance of prokaryotic cells b. long before any cells emerged c. after the appearance of eukaryotic cells d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms e. after the appearance of multicellular organisms
The body's "thermostat" is located in the
a. heart. b. spinal cord. c. thalamus. d. hypothalamus. e. cerebellum.