Which of the following attributes makes species more vulnerable to anthropogenic extinction?
A) species attractive as human resources
B) species that have evolved in the absence of predation and disease
C) species with limited geographic range
D) species with restricted habitat distribution
E) all of the above
Ans: E) all of the above
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Algae have a vascular system very similar to that found in plants
Indicate whether this statement is true or false.
Which of the following is an example of local control over breathing?
a. automated lung ventilation and lung perfusion adjustments maximizing O2 and CO2 exchange b. the aortic bodies signaling an increase in breathing rate when blood pH is acidic c. the interneuron groups of the pons refining the contractions involved with inhalation and exhalation d. the carotid bodies signaling an increase in breathing rate when O2 levels are low e. the ventral group of interneurons signaling an increase in breathing rate and depth during exercise
Replication in human cells begins at sites called ____________________, present along the
chromosome. Fill in the blank(s) with the appropriate word(s).
The cross represented by a+b+c+/abc × abc/abc is
A) a two-point testcross. B) a three-point testcross. C) a parental cross. D) a haploid cross. E) None of these