D. because the sun grows the grass the mouse eats the grass and the snake eats the mouse...
Answer:
The loss of phytoplankton is a huge problem for marine food chains, says Worm, because every creature in the ocean either eats phytoplankton or eats other organisms that depend on it.
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(1) A system can refer to a organs that work together for digestion.
(2)A system is a set of rules, an arrangement of things with a group of related things that work toward a common goal.
