When retreating glaciers carved deep coastal valleys they created:
a. fjords.
b. salt-wedge estuaries.
c. well-mixed estuaries.
d. tectonic estuaries.
e. drowned river valleys.
A
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Molting in arthropods may involve a change in
all but a. body form and maturity. b. sex. c. body size. d. eating habits. e. sensory structures.
Demography is the study of how births and deaths change population sizes over time.
Answer the following statement true (T) or false (F)
The accumulation of new mutations in a population is usually a ______ factor against the fitness of the population
A. Negative B. Positive C. Neutral
Several members of the Fitzsimmons family have polydactyly, and they differ in their numbers of extra fingers and toes. Yet, certain relatives who should have extra digits don't, such as Megan Fitzsimmons. She has two children, a son with two extra fingers and a daughter with an extra toe, and her father has an extra digit on each hand and foot. Polydactyly in this family is
A) variably expressive and incompletely penetrant. B) invariably expressive and completely penetrant. C) pleiotropic and a phenocopy. D) dominant and recessive.