During which stage(s) of human development are all major organs formed?
a. embryonic, fetal, and postnatal periods
b. fetal period only
c. embryonic period only
d. both the embryonic and the fetal periods
c
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The key characteristic of a useful antimicrobial is selective toxicity
Indicate whether this statement is true or false.
When a coral reef turns white, it means that the reef is
a. dead. b. healthy. c. in a dormant state. d. spreading.
Which of the following statements, concerning an acidic solution, is false?
A) In acidic solutions, as the concentration of hydrogen ions increases the solution becomes more acidic B) In acidic solutions, any value of the pH scale above 7 is considered acidic C) Microorganisms can grow in acidic solutions
Which of these characteristics does not promote outcrossing in flowering plants?
A. Self-incompatibility B. Physical separation of flower parts C. Apomixis D. Monoecism E. Dioecism