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

Biology & Microbiology

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Plant surfaces are covered and protected by ____

a. ground tissue b. protoderm c. vascular tissue d. meristem e. dermal tissue

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

Acetylcholine is a 

A. neurotransmitter. B. hormone. C. synthetic drug. D. pigment.

Biology & Microbiology