What is the difference between permanent gases and variable gases in the atmosphere?

What is the importantence of the carbon and nitretan cycles in the environment

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

All eukaryotic cells contain small bodies called