Among these choices, the most energetically efficient locomotion per unit mass is likely _____
A) running by a 50-gram rodent
B) running by a 40-kilogram ungulate
C) flying by a 100-gram bird
D) swimming by a 100-kilogram tuna (bony fish)
D
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Which type of country has nearly equal proportions of young and middle-aged people?
a. economically underdeveloped b. countries in Asia c. stable populations d. countries experiencing famine
Which of the following causes an exotic species to become an invasive species?
a. An exotic species multiplies and changes the ecological conditions of the environment. b. An exotic species has characteristics that are like the environment’s endemic species. c. An exotic species is transported intentionally by humans into a new environment. d. An exotic species competes for resources with an environment’s endemic species.
Four of the five answers are reasons why larger islands will have more species. Select the exception
a. Larger islands offer more habitats. b. More colonists will happen upon a larger island simply by virtue of its size. c. Larger islands are further away from mainland. d. Big islands can support larger populations of species than small islands. e. Larger populations on big islands are less likely to become extinct.
The first compound microscope was a simple tube with two lenses: The eyepiece (ocular lens) and the ________ lens.
Fill in the blank(s) with the appropriate word(s).