Answer: Single cell organisms dont need a respiratory system because oxygen and carbon-dioxe diffuses between their body tissues and the enviorment.
Fungi because of the rotting and in moist places
Answer:
The myogenic heart is the characteristics of vertebrates where continuous rhythmic contraction occurs. The myogenic heart is the intrinsic property of the cardiac muscles. Each contraction of the heart muscle regulates the flow of blood in the form of a pulse or heart rate.
Explanation:
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Answer:
Mitochondria The eukaryotic cell structure where cellular respiration occurs because they are are organelles whose membranes are specialized for aerobic respiration.