Barnacles live a(n) ____ lifestyle
a. planktonic
b. infaunal
c. nektonic
d. sessile
e. mobile
D
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The most likely region of the radio spectrum for communication with other civilizations is the water hole, the part of the spectrum
a. near the radio emission of water. b. near the radio emission of oxygen molecules. c. between the radio emissions of hydrogen and oxygen. d. between the radio emissions of hydrogen and OH. e. near the radio band where water in the Earth's atmosphere strongly absorbs energy.
Parasitism is a density-independent factor of population control
Indicate whether the statement is true or false.
Since a carbon atom has 4 valence electrons, it can complete its valence shell by forming a total of 4 hydrogen bonds
__________________ Indicate whether the statement is true or false.
Hybrid zones are typically ____, presumably because the hybrid organisms are not well adapted for either parental
environment. a. rare b. narrow
c. expansive d. experimental e. restricted to few biomes