1. Plants make their foods through photosynthesis while humans and animals obtain energy through respiration. What does it tell us?

I. Humans and animals can survive without plants.
II. Plants can undergo photosynthesis without humans and animals.
III. Plants give us oxygen while humans and animals give them carbon dioxide.
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Choices:

A. I and II
B. II and III
C. I and III
D. I, II and III

Explain your answer ^^​