One of the key contributions of the punctuated equilibrium model is that it helps explain
A) why transitional fossils are more common than Darwin would have predicted.
B) why transitional fossils tend to be rare and certain common fossil species remain unchanged for long time spans.
C) how new species arise from hybridization events.
D) why large, widespread populations tend to be the ones that evolve most rapidly and unpredictably.
Answer: B
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Answer questions 86–90 in reference to the five divisions of
vascular plants listed below. a. lycophytes b. bryophytes c. monocots d. conifers e. eudicots E 86. In members of this group the gametophyte is the dominant generation. D 87. The giant club mosses of the Carboniferous period were members of this group. M 88. Orchids are members of this group. D 89. Members of this group are heterosporous with welldeveloped seed and pollen-bearing cones. M 90. Members of this group have seeds containing two cotyledons enclosed in an ovary.
A sexual system where a male gorilla mates with several females, forming pair bonds with each of them, is called
A) promiscuity. B) monogamy. C) polyandry. D) polygyny.
The femur in a snake and pelvis in a whale are examples of
A. homologous structures. B. analogous structures. C. homeotic structures. D. vestigial structures. E. heterologous structures.
Simple staining is often necessary to improve contrast in which microscope?
A) compound light microscope B) phase-contrast microscope C) darkfield microscope D) fluorescence microscope E) electron microscope