Which statement is true about primary teeth?
A) There are 20 primary teeth.
B) There are 24 primary teeth.
C) There are 27 primary teeth.
D) There are 32 primary teeth.
A
Explanation:
B) There are fewer than 24 primary teeth.
C) There are fewer than 27 primary teeth.
D) There are 32 secondary teeth but fewer primary teeth.
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The force arising due to the tendency of water to move by osmosis is called __________
Fill in the blank with the correct word.
The absolute refractory period ends when
A. inactivation gates of voltage-gated Na+ ion channels reopen. B. activation gates of voltage-gates Na+ ion channels reopen. C. the sodium-potassium exchange pump stops. D. voltage-gated K+ channels open. E. None of these choices is correct.
A structure known as the corpus luteum secretes
A) testosterone. B) progesterone. C) aldosterone. D) cortisone. E) androstenedione.
One of the general functions that all cells must maintain throughout their life is the ability to divide and give rise to new cells
Indicate whether this statement is true or false.