A warm, dry place in direct sunlight but some cacti will be sunburnt by direct sunlight so indirect sunlight is usually used.
Use the plural cacti.
Call it 'Spike.'
I water my Mammillaria cacti once the soil has dried out completely. This is recommended for all cacti, it is better to water them not as often rather than regularly because if you get root rot then your cacti will die.
Yes: Prickly Pears, Barrel cacti, Saguaro cacti, Aztekium cacti, and Echinopsis cacti a.k.a the hedgehog cactus
cactus for a single plant cacti for plural
All cacti are succulents, but not all succulents are cacti.
No, mealworms do not eat cacti and cacti do not occur naturally in the Sahara. Cacti are natives to American deserts.
There tons of genera of cacti.
No, cacti do not grow in the Arctic.
Yes, cacti are freaking awesome
No cacti grow naturally in the Sahara. Cacti are natives of the Americas, not Africa.
No cacti live naturally in the Sahara. Cacti are strictly natives of the Americas.