Spina bifida is one of the most common and most complex birth defects involving the ____ system
a. nervous
b. circulatory
c. respiratory
d. digestive
e. endocrine
a
Biology & Microbiology
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The ____ horizon extends to the underlying bedrock, and consists of mineral particles and rock fragments but
generally no organic material?
a. A b. B
c. C d. D e. O
Biology & Microbiology
What is the principal substance that causes
phototropism in stems or leaves?
a. auxin b. gibberellin c. abscisic acid d. ethylene e. all of these
Biology & Microbiology
Which base(s) pairs with cytosine?
a. adenosine b. cytosine c. thymine d. guanine e. cytosine and thymine
Biology & Microbiology
The main function of the large intestine is to
A. supply enzymes for digestion. B. remove water. C. absorb nutrients. D. produce vitamins.
Biology & Microbiology