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