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Debora [2.8K]
3 years ago
14

Blood returning to the heart from the pulmonary circuit first enters the __________.

Biology
1 answer:
Kaylis [27]3 years ago
8 0
Enters the left atrium...this is the oxygenated blood from the lungs (pulmonary)
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Explanation:

  • The Biosphere on earth is composed of all the ecosystems, while each ecosystem is composed of the abiotic and biotic components and their mutual interactions. Aquarium is an example of aquatic ecosystem.
  • Abiotic components constitute the non-living part of the ecosystem.
  • Biotic components constitute the living part of the ecosystem.
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  1. The abiotic components include the air, water, heat, minerals, sunlight, fluorescent light.
  2. The biotic components include the aquatic plants, aquatic animals and  the bacteria (in the filter attached to the aquarium).
  • These bacteria are responsible for fixing dissolved nitrogen gas present in the water of the aquarium to ammonium and are called nitrogen-fixing bacteria.
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