Answer:
A lot of birds sing or dance to attract their mates or show off their beautiful colors. Fireflies flash their lights to attract females.
Explanation:
See answer above.
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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:
What are the experiments?
<span>True. Smooth muscle comes next and striated muscle is last.</span>