An average number of spines on a cacti may vary from the species of the cacti. A desert cactus can grow up to 2000 spines without a problem. However, a normal house cactus can only grow up to 800-1000 spines.
Cacti might have had predators that would eat them in their new environment and cacti might have learn to adapt to that with their spine-formed leaves.
The cactus has evolved to live in areas with little rainfall. They have lost there leaves and in their place have grown spines which cut down on water loss. The spines also provide some protection from animals that might be tempted to eat the plant. Some cacti have dense spine coverage that help shade the plant from intense sunlight.
No, cacti are strictly New World plants. They do not grow naturally in the Sahara. Any cacti you might see there were planted by man.
Cacti can live in the tropics, but they will probably die from too much water. Cacti retain water so if there is too much water, they basically drown. Tropics tend to have clay soil, and cacti need sand because of the way their roots grow and how the sand in the deserts retain the water, and clay might affect the cacti.
A mix of the two is the best. Plus, you have to remember that it has to be watered. But it might be best to put it in sand because in shows and movies it shows cacti in their natural environment.
i might be wrong but 5.4
Yes, but it might die after the lionfish poisons it using its spines.
They have thick photosynthetic stems, waxy coatings on their surfaces to prevent water loss and also they are succulents, where they store water since they get very little from their environment. Also, since they are covered with spines then animals that might be interested in eating them for a source of hydration are deterred from doing so. (If the cactus were bitten, a lot of water loss would occur)
it depends on the house. there is no set number but there might be an average.
You might be lucky and find the element in the first node, but equally you might be unlucky and not find it until the last element. The average case is that it takes half the number of nodes in the list.
You might be lucky and find the element in the first node, but equally you might be unlucky and not find it until the last element. The average case is that it takes half the number of nodes in the list.
Anything might cause a rash, if the individual was sensitive enough to it; although punctures are the usual complaint with cacti.