Answer:
They use a hard shell, but not hard enough though because we humans can get through them hehehe
Answer:
2. Grains of rice
Explanation:
Everything else is microscopic.
Photosynthesis produces oxygen gas by the reaction of sunlight and carbon dioxide. Every living thing living in an ecosystem requires oxygen to breathe and to survive.
What is this gizmo that you are talking about
Answer:
I am pretty sure it is B, weathering and erosion. Hope this helps!