Algae are generally present in __________.
A. Water
B. Sand
C. Beside wet walls
D. All of the above
Algae are _______ in color.
A. Red
B. Green
C. Brown
D. All of these
A. Water
B. Sand
C. Beside wet walls
D. All of the above
A. Red
B. Green
C. Brown
D. All of these