Succession happens because species in the habitat alter that habitat in ways that assist other species. There are three dynamic concepts that are of critical importance for succession to take place. They are
A. establishment, facilitation, and inhibition.
B. symbiotic relationships, facilitation, and aposematic coloration.
C. establishment, coevolution, and competitive exclusion.
D. competition, climax communities, and tolerance.
E. competition, inhibition, and coevolution.
A. establishment, facilitation, and inhibition.
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Stem cells are _____
a. unspecialized b. specialized c. unable to divide d. always pluripotent e. only found in embryos
The major cells that function in the nonspecific immune response for the defense against microorganisms are:
a. dendritic cells. b. macrophages. c. lymphcytes. d. polymorphonuclear cells.
Amniotes differ from earlier vertebrates by
a. their large size. b. their three-chambered heart. c. their internal fertilization. d. the possession of a slimy skin. e. having external scales.
Why do chromosomes resemble the letter X when viewed during metaphase?
A) Because they all appear and function as X chromosomes at that stage. B) Because there are two sister chromatids joined at a point in the middle (the centromere). C) Because microtubules encircle and attach pairs of chromosomes to each other at the centromere. D) Because each X-shaped structure is actually four chromosomes joined at the centromere.