1.    1
2.    2
3.    2
4.    1
5.    The control is the group of birds not getting the vaccine.
6.    The vaccine is the independent variable.
7.    The dependent variable is whether or not the bird gets the disease.
8.    2
9.    4
10.  3
11.  1
12.  2
13.  4
14.  3
15.  The independent variable is the one the experimenter manipulates.
        The dependent variable depends upon or is influenced by the
        independent variable.
16.  2
17.  2
18.  3
19.  antibody
20.  3
21.  2
22.  1
23.  1
24.  1
25.  3
26.  1

27.  Insulin converts excess blood glucose into glycogen which is stored in the liver
       and muscles.   Insulin also attaches to glucose molecules and takes them into
       the cells lowering glucose in the blood stream.

28.  The nucleus and brain have similar functions as the nucleus has the code (DNA) to direct
       cellular activities and the brain controls body functions.
       The food vacuole stores and digests food and so does the human stomach.
       The contractile vacuole pumps out excess water and so does the human kidney.
       The endoplasmic reticulum serves as the transport channels in the cell in a
       similar manner to the way blood vessels transport materials in humans.      

29.  4 
30.  3
31.  1
32.  3 (ie. glucose)
33.  3
34.  3
35.  4

36.  Active transport involves the movement of materials from low to high concentration.   Diffusion
       (passive transport) involves the movement of materials from high to low concentration.

       Active transport requires energy in the form of ATP to occur.   Diffusion (passive transport)
       does not require an energy input to occur.

37.  receptors or receptor molecules
38. a graduated cylinder or a pipette