Which phyllotaxes allow for leaves on a stem to lie flat without bending or breaking?
a. spiral and opposite
b. alternate and whorled
c. alternate and opposite
d. spiral and whorled
c. alternate and opposite
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Which type of interaction is not antagonistic?
A. parasitism B. commensalism C. competition D. predation E. amensalism
Which phrase defines the function of smooth muscle?
A. slow, involuntary movements in multiple organs B. skeletal movement C. heart contraction D. flexible support E. connects muscle to bone
Which statement concerning REM sleep is true?
a. During the REM stage, delta waves are emitted. b. Most people spend almost all of their sleep time in the REM stage. c. The preoptic area of the hypothalamus stimulates REM sleep. d. During REM sleep, blood flow to the entire brain decreases. e. REM sleep is absolutely necessary, as a lack of this stage causes anxiety and irritability.
If most of the individuals of a human population are in their pre-reproductive years, you would expect the population size to ________ after 20 years
A) stay the same B) increase C) decrease D) decrease and then stabilize