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.
G- guanine
A-adinine
T-thymine
C-cytosine
This happens in meiosis l. :)
Answer: ABO blood group system
Explanation:
