They perform cellular respiration but not photosynthesis.
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Plants utilize carbon dioxide (CO2) to perform photosynthesis. This is fortunate, because all living things produce CO2 as a byproduct of respiration and oxidation. If the plants didn't absorb it, it would build up in the atmosphere to dangerous levels, and life as we know would cease to exist.
No,it doesn't. As in human's respiratory system we inhale oxygen and exhale carbon di oxide so oxygen is necessary Abdul jabbar ziay says that human heart perform aerobic respiraion instead of anaerobic.
The heart takes in oxygen from the environment and delivers it to cells.
Puppeteers are people who perform using puppets. They often perform for church events/groups.
Earthworms respire and take in oxygen directly from the skin and releases co2 from the skin as well.It has no vascular system so it gets all it's oxygen through diffusion through it's skin if that's what you mean. In other terms its individual cells respire just as any other animal cells would.