You should ask what are some different genera of cacti, because the genus name comes before the species name. An example would be Echinopsis (genus) oxygona (species), so that would look like Echinopsis oxygona.
Yes some species of cacti are food for animals.
It depends on the species. Some cacti can live for generations up 100-300 years.
No, not all cacti have spines. Some species of cacti have smooth surfaces or small bumps instead of spines. Spines are a common feature in many cactus species, but not a universal one.
No, a barrel cactus and a saguaro are two different species of cacti. Barrel cacti are smaller, rounder cacti with ribs and spines all around, while saguaros are taller, columnar cacti with arms that grow as they age. Both are native to the deserts of the Americas, but they have distinct characteristics.
Saguaro cacti are about 100 years old when they get arms. Other cacti vary.
Cacti are strictly American Species and do not occurr naturally in any Australian Desert. However, prickly pear cacti have been introduced to some of Australia's deserts and have turned into a noxious invasive species.
The flowers, although some species also reproduce vegetativly
Cacti are natives only to North and South America and not to Australia. Any cacti found in Australia were introduced by humans and in some areas they have become a noxious invasive species.
Yes, there are numerous species of cacti in the Mojave Desert.
Some lions live in areas that have cacti, but cacti are not necessarily part of their habitat.
Cacti do not have leaves. However, some species can be propagated by cuttings from the stems.
It just depends on the genus/species, but if you bought a cactus from a home improvement store and it was small it will grow to be large depending on the genus/species. Most of the cacti sold at home improvement stores are cacti that grow to be large.