When a forest gradually merges into a grassland over a wide area, the border between the two landscape patches is referred to as a(n)
A) narrow border.
B) convoluted border.
C) perforated border.
D) ecotone.
D
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The 5' and 3' designations used in reference to DNA and RNA sequences are assigned to the
A. oxygen atoms contained in the deoxyribose and ribose. B. hydrogen atoms that form hydrogen bonds between the nucleotides. C. nitrogen atoms in the nitrogen bases. D. carbon atoms in the nitrogen base purines and pyrimidines. E. carbon atoms of deoxyribose and ribose.
When the ciliary muscle contracts,
a. close objects become focused on the retina. b. a right-side-up and nonreversed pattern of light rays stimulate the retina. c. the lens flattens, and the focal point moves farther back in the eye. d. the pupil enlarges. e. all of these occur.
The process of oogenesis is completed at ________
Fill in the blank(s) with correct word
Identify the labeled structures of the urinary system and its associated blood supply in the diagram. Briefly describe the function of each structure. 
A:________E:________B:________F:________C:________G:________D________H:________
What will be an ideal response?