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