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:
The correct answer is letter "B. Conical shape ." The characteristic of a pine tree is an adaptation to the climate of the northwestern coniferous forests is that it is in conical shape. If C were needle like leaves that would be the best answer.
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