What is the cancer causing sgent in tobacco?

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind

Aplant may open end close its stomata to prevent excess water loss and maintain

What controls activities within a eukaryotic cell?