Which statement best describes why an island food web could be considered a closed system

a. energy flows freely into and out of the island food web

b. energy enters and exits the system matter does not

c. new energy enters the food web and matter is created as it moves through the web

d. no energy exits outside the food only matter

Which feature indicates that mars resides in the inner region of the solar system

Name the non metal condut electricity

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?