What is the closest star to our solar system

Alpha Centauri

Explanation:

The Alpha Centauri system is the closest star system to the sun—The Alpha Centauri system is 4.36 light years away from earth and our sun, which is a very long distance, but still short enough that it is the current third-brightest star/star system visible from Earth. (In our sky's dome—we see this multiple system as a singular star)

chordata is the answer

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.