Morphological characteristics are widely used for taxonomic classifications because
a. they are the most likely indicators of evolutionary relationships.
b. they are the most likely to represent reproductive isolation among groups.
c. they are easy to assess in living, preserved, or fossilized specimens.
d. they are always the exact phenotypic expression of genotypes.
e. they indicate genetic relatedness.
C
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Where do mesophyll cells usually obtain CO2 for photosynthesis?
A. the air spaces that surround them B. the xylem C. other mesophyll cells D. from cellular respiration E. None of the answer options is correct.
The maximum amount of air that can be taken into
the lungs in a single deep breath is the a. vital capacity. b. tidal volume. c. total lung capacity. d. alveolar volume. e. inspirational capacity.
An extracellular ground substance is characteristic of
a. muscle tissue. b. epithelial tissue. c. connective tissue. d. nervous tissue. e. embryonic tissue.
Of the following three types of nucleic acids—DNA, mRNA, tRNA—which is most likely to contain modified bases?
What will be an ideal response?