Question

Epigenetic changes by dna methylation in chronic and intermittent hypoxia

Answer 1

Explanation:

DNA methylation of cytosine residues is a well-studied epigenetic change, which regulates gene transcription by altering accessibility for transcription factors. Hypoxia is a pervasive stimulus that affects many physiological processes.

Answer 2

Answer:

Spreading of Pteridophytes are limited and restricted to narrow geographical regions because they don't have stomata in leaves and they don't have vascular tissue present. Vascular tissues have Xylem and Phloem tissues which release spores, not seeds.