Crossword

            1 J   2 C  H  I  T 3 I  N  
             O            N    
          4 L  I  G  N  I  N    T    
      5 C      N            E    
6 H  Y  D  R  O  S  T  A  T  I 7 C    R    
       O              A    N    
       S     8 E  X  T  E  R  N  A  L  
  9 C    S              T    L    
10 C  E  L  L  U  L  O  S  E    I     11 T  
   L    I              L      E  
   L    N       12 L  I  G  A  M  E  N  T
   W    K   13 B          G      D  
   A     14 C  O  L  L  A  G  E  N    O  
   L        N                N  
15 A  L  L  O  M  E  T  R  I  C          

Across:

2A carbohydrate that serves as an important support material in the cell walls of fungi and in the skeletons of animals.
4A complex molecule largely responsible for the rigidity of the cell walls of woody plants.
6(____ skeleton) A support structure that depends on the interaction between a fluid under pressure and an elastic membrane for stiffness.
8(____ skeleton) A skeleton that surrounds the soft tissues of the animal it supports.
10A carbohydrate produced by plants and some other organisms that makes up much of their cell walls.
12A collagen-rich connective structure that attaches bone to bone in vertebrate skeletons.
14A protein produced by the connective cells of animals that resists tension.
15(____ relationship) A relationship between body size and another functional or structural property of an organism.

Down:

1A flexible connection between the rigid elements that make up an animal skeleton.
3(____ skeleton) A skeleton that lies within the soft tissues of the animal it supports.
5(two words, no space) A connection between two molecules that generally increases resistance to compression or tension, and often increases stiffness.
7A support structure found in animals that consists of connective cells that secrete a matrix rich in the protein collagen.
9(two words, no space) A support layer that lies outside the plasma membrane of the cells of many prokaryotes, fungi, and plants.
11A collagen-rich connective structure that attaches muscle to bone in vertebrate skeletons.
13A support structure found in most vertebrate animals, formed by connective cells that secrete a mineral matrix rich in calcium. The core of a ____ serves as the site of red and white blood cell production.