Answer:
Pus or thick fluid caused by infection
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Answer: effects of the evolution of photosynthesis. Photosynthetic organisms dramatically increased atmospheric oxygen levels between 2 and 2.5 billion years ago. This change created selective pressure favoring organisms that used oxygen to produce energy-containing molecules.
change the wording a little bit.
Explanation:
Answer:
peristalsis first occur in oesophagus
so, option A is correct