The outer skeleton provides protection due to the fact that invertebrates do not have backbones
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Phagocytosis is the only effective way invertebrates fight disease
Photosynthesis still occurs but the amount of red pigment is greater than the amount of green pigment. The chlorophyll still absorbs light energy. The red leaves does not affect the process of photosynthesis.
Because b appears to be an intrusion, the answer should be A.
