Ground squirrels are found in many areas of the united states. they live in underground burrows and are often attacked by birds of prey, coyotes, and bobcats. which of the following is a limiting factor for a ground squirrel population?
a. a population of tree squirrels
b. a population of hawks
c. genetic variability
d. breeding season

b.) a population of hawks

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .

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)]