Manatees are mostly found in:
a. cold polar waters.
b. Antarctica.
c. tropical estuaries.
d. temperate coastal areas.
e. Eastern Pacific Ocean.
C
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DNA and RNA are similar in that both
a. contain the same sugar. b. are double-stranded molecules. c. contain nitrogenous bases. d. are in the form of a double-helix. e. are very long molecules.
Four of the five choices listed below relate to
speciation. Select the exception. a. postzygotic b. allopatric c. parapatric d. punctuation e. sympatric
Mules are an example of:
a. hybrid breakdown. b. hybrid inviability. c. hybrid sterility. d. macroevolution. e. microevolution
Which of these statements best explains a benefit of an agroforestry system?
A) It stimulates independence of a community from its natural environment as it modifies the landscape into more modern configurations. B) It provides for uses of the trees that are removed as the system is developed into fields so that there is wood for construction of buildings. C) It makes use of nutrient rich soils to plant successive monocultures that are primarily cash crops used to support the community. D) It mimics the diversity and structure of trees, shrubs and other herbs that are naturally found in the forest and includes many native species