Which of the following systems is NOT directly involved with regulation and maintenance of the body's chemistry?
A. the digestive system
B. the circulatory system
C. the respiratory system
D. the urinary system
E. the reproductive system
E. the reproductive system
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Red algae can only live in deep waters because their photosynthetic pigments are adapted only for these depths
Indicate whether the statement is true or false
Four of the five answers are characteristics of diatoms. Select the exception
a. two-part silica shells b. photosynthetic c. some produce a toxin that accumulates in fish, crabs, and shellfish d. flagella e. live in lakes, seas, and damp soils
Conjugation by which of the following with an F- cell results in a cell that remains F-?
A) F+ B) Hfr C) F D) A and C E) B and C
Alternative forms of a gene (producing differences in the trait) are called
What will be an ideal response?