The DNA double helix consists of two long separate strands joined together by base pairs. When the molecule is due to replicate the double helix unwinds and the two strands unzip themselves. This is made possible by the weak hydrogen bonds that link the bases. The information on the DNA strands which is in form of base sequence is copied out onto a new DNA strand using the parent DNA as the template.
D.hot air rising and cooler air falling. A is example of radiation or conduction. B is example of radiation. C is example of conduction. D is example of convection
