The other type of cacti are jungle cacti, and they do need humidity. These plants are more succulent-looking, and lack real spines, similar to 'Christmas' cactus. If this is the type you have, they like a bit more water, and during spring and summer, water plentifully to keep the potting mixture thoroughly moist.
There are about 3-4 million animaks euthanized each year by shelters. There actually are about 4-6 million animals euthanized in shelters in America each year. The above are just estimates. Shelters don't always keep accurate records, and no thorough surveys have been done. No one knows the real numbers.
Putting an accurate figure on this question is extremely difficult. The most reliable estimate, based on data from 2005, suggests 115.3 million animals are used in experiments annually (although the authors concluded this âis still likely to be an underestimateâ. It will also exclude virtually all invertebrates).