Define how one goes about selecting a sample for a clinical trial.

What role do bacteria play in the carbon cycle

Where would you expect to see seedless plants, such as ferns and mosses? a. in a botanical museum, because they are all extinct b. low and close to the ground in a moist environment c. climbing high while circling the branches of another plant d. deeply rooted in a forest with a trunk that reaches 20 meters or more

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry