Which of the following correctly lists the three forms of nitrogenous waste in order from least to most toxic?
A. uric acid, urea, ammonia
B. uric acid, ammonia, urea
C. urea, uric acid, ammonia
D. urea, ammonia, uric acid
E. ammonia, urea, uric acid
A
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Photoperiodism is the
a. duration of flowering in a plant. b. amount of light needed by a plant to exhibit normal growth. c. biological response of a plant to a change in the length of daylight relative to darkness. d. light phase of photosynthesis during which photolysis of water occurs. e. time of the day when light shines.
Position of gonads varies in different animal groups. An octopus has gonads _____
a. on the back of its head b. at the ends of its arms c. in the abdominal cavity d. in the coelom
e. on its penisIn humans, ________ divide by meiosis to produce eggs and sperm.
A. somatic cells B. gametes C. triploid D. zygotes E. germ-line cells
The collective human ecological footprint is now much larger than Earth's sustainable resource base
Indicate whether the statement is true or false