Plants in the desert-adapted families Cactacea (cactus) and Euphorbia (euphorbs) share many of the same physical characteristics, such as succulent stems that store water and CAM photosynthesis, but they do not share a recent common ancestor. This evidence suggests that these families are an example of
A. divergent evolution.
B. convergent evolution.
C. homologous structures.
D. vestigial structures.
Answer: B
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Plant surfaces are covered and protected by ____
a. ground tissue b. protoderm c. vascular tissue d. meristem e. dermal tissue
What is one difference between active and passive transport?
a. passive transport requires energy b. passive transport requires a protein channel c. active transport requires energy d. active transport only moves water molecules
The general order of classification below the domain or kingdom level is ________.
A. phyla, class, family, order, genus, species B. phyla, class, order, family, genus, species C. phyla, order, class, family, genus, species D. phyla, order, family, class, genus, species
Acetylcholine is a
A. neurotransmitter. B. hormone. C. synthetic drug. D. pigment.