Answer:
Cell surface receptors (membrane receptors, transmembrane receptors) are receptors that are embedded in the plasma membrane of cells. They act in cell signaling by receiving (binding to) extracellular molecules. They are specialized integral membrane proteins that allow communication between the cell and the extracellular space.
Explanation:
A tree is considered living because it takes in nutrients like other living things. The tree is also made up of cells which all living things are made up of. Trees can also produce offspring. Just like any other living thing.
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It was a Greek astronomer called Aristarchus of Samos.
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- Hannah ❤<span />
B. Pine trees, this is the answer that was right after I took the test XD
