Because people had as pets when they got to big they let them into the wild and they came a different place
The amount of gravity on mars. How much power is needed to slow it down enough for it to land safely. Also what angle to put it into mars orbit so it lands where the engineers know where it is going to land.
Answer:
Book lungs
Explanation:
The horse shoe crab has a hard outer surface carapace which has the shape of a horse shoe.
It has book lungs which come in 5 sets. The lungs are usually found on the ventral side of the crab.
The book lungs acts as gills which is used in breathing when the horseshoe crab is in water . The book lungs also helps the crab to breathe on land for a certain period of time provided the lungs are moist.