What comes together at a joint?
a. an arc of movement
b. flexible tissue
c. two bones
d. skin and hair

C. two bones ... you may get confused and ligaments < they only hold them together.. a joint is a connective bone which means it can attach two or more parts with it. This is in your skeletal system process (you will learn more about if you take Biomedical Science or Human body systems!) 

Hope This Helped :) 

I’m going to go with b!

Humans can affect weathering and erosion in several ways.  humans cause  increases in acid rain and pollution, which increase the amount of  weathering  agents in the air and water, and then on land.for an easy answer: 1) acid rain2) pollution