Answer:
What sends oxygenated blood back to the heart from the lungs?
Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.
Explanation:
- <em>Estrogen.</em>
- <em>Progesterone.</em>
- <em>Prolactin.</em>
- <em>Testosterone.</em>
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<em>A/N</em><em>: hope this help </em>
Answer: boom
Explanation: hope this is right :)
Four critters that are pollinators are
- Bumblebee
- Honeybee
- Rufous Hummingbird
- Flower fly
Hope this helps!