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.
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
Yes, there are numerous species of cacti in the Mojave Desert.
No, the saguaro is a distinct species of cactus and different from the various barrel cacti.
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.
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.
In the desert, there are different animal species that feed on cacti, including wrens, certain types of sparrows, Gambel's quail, jackrabbits, peccaries, desert bighorn sheep, and rodents. Bats, bees, and wasps also feed on the nectar of cacti flowers.
Most deserts that have cacti do not get cold, except in the dead of winter. Even those cacti growing in a cold winter desert have adapted to survive some freezing weather. However, if a usually hot desert has a sudden severe freeze in winter, some species of cacti are unable to survive.