Answer:In old stems the epidermal layer, cortex, and primary phloem become separated from the inner tissues by thicker formations of cork. Due to the thickening cork layer these cells die because they do not receive water and nutrients. This dead layer is the rough corky bark that forms around tree trunks and other stems.
Explanation: wikipedia.
Answer: B
Explanation: Multiple different combinations of bases (A, G, C, T) can code for the same amino acid. This means that there are more possible combinations of the bases than there are amino acids. There are 20 amino acids and the four bases can have up to 64 different codon combinations.
Answer:
i think its a im not sure though
Each upward movement of the basilar membrane causes the stereocilia of the inner hair cells to bend, opening K+ gates.
<span>B. tiny structures in the cell that carry out the cell's activities</span>
