Marine microbes inhabit sediments on the ocean floor at a depth of up to at least ________.
A. one foot
B. 100 feet
C. 0.6 kilometers
D. ten feet
Answer: C
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Which group produces a toxin somewhat similar to that produced by Shigella dysenteriae?
A. enterotoxigenic B. enteroinvasive C. enteropathogenic D. enterohemorrhagic E. All of the choices are correct.
Angiosperms have two types of xylem tubes, each composed of one cell type, either ____ or ____
a. vessel elements; companion cells b. sieve elements; companion cells c. sieve elements; tracheids d. vessel elements; sieve elements e. vessel elements; tracheids
Which of the following occurs during gastrulation?
a. formation of the gray crescent region b. formation of ectoderm, mesoderm, and endoderm c. closure of the archenteron d. formation of the blastocoel e. radial cleavage takes place
To research health conditions on your own, what source is best?
Internet sites selling products to help improve your health An Internet forum where someone with no scientific or medical training writes an article Articles found in medical literature All of the above