An air mass's relative humidity is a measure of how much water vapor it contains compared to how much it can contain. Different types of air masses, with different temperatures and pressures, are able to hold different amounts of water vapor. Which of the following could cause the relative humidity of an air mass to change?

A. a change in its temperature

B. a change in its pressure

C. a change in its water vapor content

D. all of these

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

meiosis is the correct answer

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)]