A. Immune system
It helps our bodies fight everything that comes in our path.
<u>A (they belong to the same group of the periodic table)</u>
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The answer is A because C doesn't have a causal relationship, D doesn't strongly effect most chemical properties, and chemical properties remain unchanged with state of matter.
Answer: Most autotrophs use a process called photosynthesis to make their food. In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose.
Explanation:
