State one adaptation of PCT for high degree of selective reabsorption.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Proximal Convoluted Tubule (PCT):** The PCT is a part of the nephron in the kidney, responsible for reabsorbing a significant portion of the filtrate that is produced during the filtration process in the glomerulus.

2. **Function of PCT:** The primary function of the PCT is to reabsorb approximately 50-60% of the glomerular filtrate. This includes essential substances such as glucose, amino acids, and ions.

3. **Adaptation for Selective Reabsorption:** One key adaptation of the PCT that facilitates a high degree of selective reabsorption is the presence of a brush border on its epithelial cells.

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