In addition to abiotic factors, community composition of plants can be severely compromised by
A) parasites and pathogens.
B) mutualistic birds.
C) rapid coevolution.
Answer: A
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Life probably would never have emerged on
Earth if the ancient atmosphere had been the same as the present one in regard to a. carbon dioxide. b. hydrogen. c. oxygen. d. nitrogen. e. carbon monoxide
Which of the following elements is a plant micronutrient?
1.Calcium 2.Iron 3.Potassium 4.Sulfur
Which of the following describes the overall three-dimensional folding of a polypeptide?
A) Primary structure B) Secondary structure C) Tertiary structure D) Quaternary structure E) None of the above
Identify and briefly describe the function of the labeled structures in the human eye pictured here. 
A:________B:________C:________D:________E:________F:________G:________H:________I:________J:________
What will be an ideal response?