If you were to penetrate through the epidermal
layer of a root, you would next encounter the
a. xylem.
b. endodermis.
c. cortex.
d. phloem.
e. pith.
C
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Which of the following mechanisms make it difficult to classify bacteria into different species groups?
A. vertical evolution. B. horizontal gene transfer. C. sexual reproduction. D. asexual reproduction. E. low mutation rates.
During inspiration (a.k.a. inhalation) of air into the lung of a mammal
A. the chest cavity has a positive pressure. B. the diaphragm moves upward. C. the diaphragm contracts. D. the rib cage moves down. E. the intercostal muscles relax.
Areas that receive heavy rainfall tend to have ____ soils, and arid regions tend to have ____ soils
a. acidic; alkaline b. pH-neutral; acidic c. alkaline; acid d. acidic; pH-neutral e. pH-neutral; alkaline
What evolutionary advances are demonstrated in the nervous systems of bilaterally symmetrical animals? What will be an ideal response?