18. Which of the following describes an ECOSYSTEM? *
1 point
A Boulders heated by the sun allow lizards to warm themselves so that they can
catch insects near the stream
B Two lion cubs play with each other while their mother is nearby

C A robin and a blue jay chirp and peck at one another in competition over a worm
D A hawk Swoops down and eats a fish, which recently ate a fly.

Help m I need help in this question

d) physical means can be used to separate the components of air.

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.