Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?
A) calcium
B) iodine
C) sodium
D) phosphorus
B
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Recent research suggests that a homing pigeon can navigate to its home coop from any direction by using ____ as
their compass and ____ as their map.
a. the position of the Sun; olfactory cues b. the position of the stars;other visual cues c. olfactory cues; the position of the stars d. olfactory cues; the position of the Sun e. landmarks; olfactory cues
How are acrosomal proteins released?
a. The most soluble acrosomal proteins are released first; bound acrosomal proteins are released second.
b. Bound acrosomal proteins are released first; soluble acrosomal proteins are released second. c. Acrosomal proteins are released in one phase. d. Acrosomal proteins are released after the zona pellucida is penetrated. e. Acrosomal proteins are released as the sperm travels through the female reproductive tract before reaching the egg.
Annelids are segmented worms
____________________ Indicate whether the statement is true or false.
What is the overarching term to describe the regulation of the internal environment in animals? Describe two processes or structures described in this unit that allow mammals to regulate body temperature. For each process or structure, describe how it works to regulate temperature
What will be an ideal response?