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.  convergent evolution.
B.  homologous structures.
C.  vestigial structures.
D.  divergent evolution.


A.  convergent evolution.

Biology & Microbiology

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Gastrulation in animal cells is able to take place because:

A. animal cells do not have cell walls. B. mitosis stops so that cells are able to move around. C. cells in the meristem are able to migrate.

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In the cyclic pathway, electrons ejected from photosystem I return to:

a. photosystem II b. photosystem I c. the stroma d. the outer chloroplast membranes e. ATP synthase

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The most dangerous type of arrhythmia is

a. tachycardia. b. ventricular fibrillation. c. brachycardia. d. atrial fibrillation. e. an electrocardiogram.

Biology & Microbiology

An elongate uniramid with many legs as well as poison claws is known as a(n):

a. mite. b. tick. c. insect. d. centipede. e. millipede.

Biology & Microbiology