What are some reasons an organisms carrying capacity would increase

A few examples could be an increase in food, an increase in shelter, a decrease in predators, or more land.

the sphincter muscles at the end of the digestive tract is the anus.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]