NASA Scientists send a small population of dogs to a new planet in order to test if it will be hospitable for human colonization. Through a random lottery, only Great Dane and St. Bernard dog breeds are sent, and the resulting population consists of tall, longhaired dogs. After 100 years these dogs return to Earth and are no longer able to mate with Earth dogs. This scenario is an example of
A. sympatric speciation through genetic drift.
B. sympatric speciation through natural selection.
C. allopatric speciation through genetic drift.
D. allopatric speciation through natural selection.
Answer: C
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The following question(s) relate to the data table below, showing typical fluctuating pH and dissolved oxygen levels in a fish pond with a heavy concentration of algae over a 24-hour period.TimeOxygen (ppm)pH2 a.m.4.57.74 a.m.2.87.26 a.m.2.26.88 a.m.2.56.810 a.m.3.97.2Noon6.57.72 p.m.10.08.34 p.m.12.18.86 p.m.13.19.28 p.m.13.09.210 p.m.12.08.8Midnight10.88.3You are investigating a massive fish kill in one of the shallow lakes in the area. Lab reports show no toxins in the water, but a monitoring station reported these oxygen and pH values. Based on the table above, what, if any, is the relationship between oxygen and pH?
A. No relationship: there is no pattern between oxygen and pH B. Exponential relationship: when one increases, the other increases 10 to 100 times C. Inverse relationship: when one increases, the other decreases D. Direct relationship: when one increases, the other also increases
Chaparral is
A. a type of shrubland/grassland. B. a type of forest. C. restricted to serpentine soils. D. widespread in Africa. E. distinguished by tall trees.
In sexual reproduction in multicellular organisms, produces haploid gametes, and unites the gametes to create diploid zygotes.
A. meiosis; fertilization B. mitosis; pollination C. fertilization; meiosis D. pollination; fertilization E. fertilization; mitosis
Characteristics of rickettsias include
A. arthropods serve as life cycle hosts and vectors. B. host cells are required for ATP metabolism. C. obligate parasites requiring host cells for growth. D. gram negative coccobacilli. E. All of the choices are correct.