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.
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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.
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
The most dangerous type of arrhythmia is
a. tachycardia. b. ventricular fibrillation. c. brachycardia. d. atrial fibrillation. e. an electrocardiogram.
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.