The most common second messenger used by hydrophilic hormones is
a. calcium
b. cyclic AMP
c. chromatin
d. messenger RNA
e. plasma proteins
B
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Skin, hair, and nails are associated with the ________ system
A) skeletal B) muscular C) integumentary D) endocrine E) immune
Based on function, the vast majority of neurons are
A. sensory neurons. B. motor neurons. C. unipolar neurons. D. bipolar neurons. E. interneurons.
It is best to allow all birds to perch on your hand for proper restraint
Indicate whether the statement is true or false
We noted that many features typical of vertebrates, such as a distinct head and limbs of some sort for locomotion, are seen in invertebrates such as insects and crustaceans, and even in cephalopods (squid and octopuses)
What characteristic do these animals share with vertebrates that might have led to the independent evolution of such structures?