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gladu [14]
2 years ago
14

Blood returning to the mammalian heart in a pulmonary vein drains first into the _____.

Biology
1 answer:
WARRIOR [948]2 years ago
6 0
Is there like options in this question?
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A human cell is shown in the diagram.
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Organelle 1

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Which macromolecule forms a double layer as the primary structure of cell membranes?
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Answer;
Phospholipid.

Phospholipid forms a double layer as the primary structure of cell membranes.

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