no
No they dont have air fresheners for hermit crabs
Hermit Crabs live on the bottom of the ocean and eat the grasses that grow on the bottom.
Hermit Crabs like Humidity. They need 70-80% humidity to survive. But, if it like 100 degrees and no humidity i recommend to put a fan or air conditioner on then, or in their cage.
Some hermit crabs are land hermit crabs like the ones you buy at ocean city. They have modified gills which means they CAN'T breathe underwater. Hermit crabs need moist air so they need humidity between 70 and 80 and temp 70-80.
Land crabs (most pets are) do need it while marine crabs like the ones you find at the beach do not.
No, nor the other way around. One breaths air, one breaths under water for their entire life.
In oxygenated water hermit crabs can survive for a short time. Straws can stay under the longest as their modified gills most closely resemble marine hermit crab gills. However, the time varies between the species. Generally a hermit crab will only be under for a minute or two. As long as your pool has an easy way for crabs to get out they are good at regulating when they have been under too long. A hermit crab will not drown if he has a way to climb out.
If by "air" you mean Oxygen, yes. All animals (except for that crazy jellyfish they found) needs oxygen to survive. A hermit crab's gills will filter the oxygen (or "air") out of the water. Even land hermit crabs have modified gills that need to stay moist in order to perforn the same task. If their gills dry up, they suffocate.
Yes, hermit crabs can do this because they burrow. In doing this they make air holes to keep a supply of air going to them at all times. This is why it is so important to never bury your hermit crab! In doing this you will not leave an air pocket and have a high risk factor of choking them.
Food, Water, Shelter, Air. If your talking about hermit crabs, they need humidity, a certain temp, DISTILLED water, and soo much more!
Hermit crabs drink freshwater, but need both saltwater and freshwater in order to survive. They have modified gills that can breathe air, but in order to process that air they need access to saltwater and freshwater to 'wet their gills'.
You can tell a land hermit crab from a water hermit crab by looking at the claws/arms or legs. If it is a water crab it will be blueish and if land crab it will be pinkish purpleish. If your crab is a water crab don't just throw it in water and leave it there, put a tiny bowl in it's tank or cage that is low to the ground and make sure that the water level is a bit lower than the hermit crabs top of its legs. Also have a wet sponge for each kind of hermit crab in the crabs tank.