The common characteristic of Alveolata is
A. a single, unique mitochondria.
B. a layer of flattened vesicles beneath the plasma membrane.
C. silica covering.
D. funnel-shaped, contractile collar.
E. presence of a plasmodium.
B. a layer of flattened vesicles beneath the plasma membrane.
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In addition to burning fossil fuels, humans return CO2 to the atmosphere faster than it can be removed by:
A. clearing forests for agriculture. B. polluting the oceans. C. generating nutrient pollution. D. expanding rice production. E. expanding beef production.
Which of the following best describes the route of water into the water vascular system of a starfish?
A. Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet. B. Water enters the madreporite into the radial canals and from thence into the ring canal, then the ampullae and finally into the tube feet. C. Water enters the madreporite into the ampullae and from thence into the ring canal, then the radial canals to the ampullae and finally into the tube feet. D. Water enters the ampullae and then goes to the tube feet and from thence to the radial canals, then the ring canal, and finally exits through the madreporite. E. Water enters the ring canal, then goes into the radial canals, and finally through the madreporite to the ampullae and tube feet.
Comparisons of genetic information from various invertebrate groups has ____
a. confirmed nearly all classifications that were based on phenotypic resemblances b. provided a complete and final picture of animal phylogeny c. led to a decision to forgo formal classification of animals d. led to a reshuffling of the classification of animals that is still being refined e. confirmed that some invertebrates should be classified as vertebrates
In a rank-abundance curve comparing two communities, the community with the greater species richness is characterized by a
A) lesser length of the curve and a more gradual slope. B) lesser length of the curve and a steeper slope. C) greater length of the curve and a more gradual slope. D) greater length of the curve and a steeper slope.