Which of these symptoms occur with periodontitis?
A) loosening of the teeth
B) inflammation of the gums
C) loss of bone in the tooth socket
D) dental caries or cavities
Answer:
A) loosening of the teeth
B) inflammation of the gums
C) loss of bone in the tooth socket
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If two species are close competitors, and one species is experimentally removed from the community, the remaining species would be expected to _____
A) eventually become competitively superior to the other species B) change its fundamental niche C) decline in abundance D) become the target of specialized parasites E) expand its realized niche
Afferent and efferent neurons differ in (select all correct choices):
A. their size. B. their pattern of myelation. C. the directionality of the information they send.
The sliding filament model
a. supplies the energy needed for muscle contraction. b. provides a flexing action for the muscle fibers. c. describes the action of the actin and myosin in a muscle cell. d. explains muscle fatigue. e. only explains how muscles contract, not how they relax.
Draw a cladogram that for the following animals: sponges, cnidarians, flatworms, echinoderms, chordates, molluscs,
annelids, nematodes, and arthropods. On your cladogram indicate the points where the following evolved: 1) true tissues, 2) bilateral symmetry, 3) three germ layers, 4) segmentation, 5) protostome development, and 6) deuterostome development. What will be an ideal response?