Which soil region is the most fertile soil layer where the roots of most herbaceous plants are located?
a. A horizon
b. B horizon
c. C horizon
d. D horizon
e. O horizon
A
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________ syndrome can only result from non-disjunction in the male and female.
A) YO B) XO C) XXY D) XXYY syndrome
A surprising finding of environmental metagenomic studies is that a majority of genes in the environment are
A) from microbes grown in the lab. B) viral in origin. C) eukaryotic in origin. D) from extinct microorganisms.
Which of the following choices shows the order in which white blood cells migrate to infected tissues?
A) Macrophages - monocytes B) Lymphocytes - macrophages C) Neutrophils - macrophages D) Neutrophils - monocytes E) Macrophages - neutrophils
Which part of the eye regulates the amount of light that reaches the retina?
a. fovea b. cornea c. iris d. lens