In vertebrates, most of the fluid that ultimately exits the body as urine first enters the nephron tubules by the process of ________.
A. excretion
B. secretion
C. reabsorption
D. absorption
E. filtration
Answer: E
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Which of the following describes the correct path of air through a bird's respiratory system?
A. trachea, posterior air sacs, lungs, anterior air sacs, trachea B. trachea, anterior air sacs, lungs, posterior air sacs, trachea C. trachea, lungs, anterior air sacs, posterior air sacs, trachea D. trachea, lungs, posterior air sacs, anterior air sacs, trachea E. trachea, anterior air sacs, posterior air sacs, lungs, trachea
Inside a sporangium, haploid spores arise by meiosis
Indicate whether the statement is true or false.
As few as __________ Escherichia coli O157:H7
cells can cause disease. a. 11 b. 100 c. 10 d. hundreds e. thousands
The recessive phenotype of a trait occurs in 16% of a population. What is the frequency of the dominant allele?
A. 0.48 B. 0.60 C. 0.40 D. 0.36 E. 0.16