Charles Darwin observed an orchid flower with very long, thin tubes that prevent many species from feeding on the flower nectar and pollinating the flower. He offered a prediction that some species of pollinators would eventually be found that can feed and pollinate through the small tube. You decide to test Charles Darwin's proposal by placing nets over some orchids that allow small pollinators to enter, but prevent the large sphinx moth from entering. You then compare the number of seeds produced by plants with and without the nets. The seed production is
A. a hypothesis.
B. a standardized variable.
C. a theory.
D. an independent variable.
E. a dependent variable.
E. a dependent variable.
You might also like to view...
Through studies using the animal cap assay this morphogen was shown to be important for the determination of the different types of mesoderm tissue in the developing embryo.
A. activin B. noggin C. Spemann's organizer D. Hox gene E. cadherins
A recognized set of symptoms that characterize a genetic disorder is a(n) _____
a. syndrome b. disease c. abnormality
If you lose your sensitivity to the sound of the waves but still notice a seagull flying above you, what is happening?
A. sensory adaptation in sight involving thermoreceptors B. sensory adaptation in sight and hearing involving mechanoreceptors C. competition between processing of hearing and sight involving light receptors D. sensory adaptation in hearing involving mechanoreceptors E. general sensory diminution involving mechanoreceptors and thermoreceptors
A portion of the ____, which must monitor the blood, is not subject to the blood brain barrier
Fill in the blank(s) with the appropriate word(s).