Freshwater flatworms have this type of system for osmoregulation.
A. isonephridial
B. eunephridial
C. protonephridial
D. osmonephridial
E. metanephridial
Answer: C
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The basic building block of DNA and RNA is a(n) ____
a. nitrogenous base b. sugar-phosphate backbone c. amino acid d. nucleotide e. ribose sugar
Which statement is true?
a. Blood flows from areas of high hydrostatic pressure in the arterioles to low hydrostatic pressure in the arteries. b. Blood flows from areas of low hydrostatic pressure in the arterioles to high hydrostatic pressure in the arteries. c. Blood flows from areas of high hydrostatic pressure in the arteries to low hydrostatic pressure in the arterioles. d. Blood flows from areas of low hydrostatic pressure in the arteries to high hydrostatic pressure in the arterioles.
It is thought by scientists that the earliest living organisms
a. originated on another planet. b. were photosynthetic. c. used carbon monoxide as a carbon source. d. used aerobic respiration. e. made use of sulfur and hydrogen gas as energy sources.
Comparing the body structures of organisms to find evidence of a shared evolutionary history is called ________
A) outgrouping B) relativistic physiology C) comparative anatomy D) analogous reconstruction