The tissue of the vascular plant that conducts water and dissolved minerals from the roots to the leaves is the
A. phloem.
B. xylem.
C. cuticle.
D. root.
E. stomata.
B. xylem.
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Which of the following would a population ecologist be less likely to study?
a. Density b. Growth c. Classification d. Carrying capacity
How can scientists determine what atmospheric CO2 levels were like hundreds—or even thousands—of years ago? Select all that apply
A. They can examine ice core samples from Antarctica. B. They can examine CO2 levels in the outermost layer of Earth' atmosphere. C. They can examine the number of stomata in fossilized leaves. D. They can examine the number of fossilized dinosaur skeletons from different eras.
All of the following are examples of ribozymes or ribozyme activity except
A) peptidyl transferase. B) autocatalytic RNAs. C) ribonuclease P. D) intron removal from pre-rRNA. E) zymogen.
Abdul, who is 6 years old and beginning his first day of school, comes into his classroom where some other children are eating peanuts. Within a few minutes he complains of dizziness and seems to be struggling to breathe. You suspect ________
A) chickenpox B) anaphylactic shock C) cancer D) Kaposi's sarcoma