Select the plant behavior that arises from internal stimuli.

A. Phototropism.
B. Thigmotropism.
C. Cytokinins promoting cell division.
D. Nondevelopmental formation of aerenchyma.


C. Cytokinins promoting cell division.

Biology & Microbiology

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Which brain structure is the largest and most complex?

A. The hypothalamus B. The thalamus C. The cerebrum D. The cerebellum

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Which of the following will increase the loading of oxygen onto the hemoglobin molecule within the lungs?

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The ________ involves proteins in the plasma that are activated when bacteria or fungi are present. These puncture holes in the cell walls of invaders.

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