Charles Darwin observed an orchid flower with very long, thin tubes that prevent many species from feeding on flower nectar and
pollinating the flower. He offered a prediction that some species of pollinator 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 byplants with and without the nets. The seed production is A. a dependent variable.
B. a standardized variable.
C. a hypothesis.
D. an independent variable.
E. a theory.
A scientific experiment contains three types of variables (factor or condition) in experiments: the dependent, independent and controlled variables.
The independent variable is the variables which can be changed or altered naturally or artificially like the sunlight, temperature whereas a dependent variable is a variable which depends on the independent variable and is the studied parameter of the experiment.
In the given question, since the production and the number of the seeds is influenced by the pollinator, therefore, a number of seeds will be considered the dependent variable.
Vitamic C or ascorbic acid acts as a cofactor in the process of collagen synthesis. It has been shown that lack of vitamin C leads to the impaired collagen synthesis. Beside that activity, vitamin C has many other funtions within organism:
antioxidant
cofactor in other enzymes
involved in wound healing (repair of tissue)
involved in the production of some neurotransmitters...
