The characteristics of two methods of heat transfer are listed below: Method A: No material medium is required and heat is trans
ferred in all directions Method B: Material medium like gas or liquid is required and heat is transferred only in the vertically upward direction Which statement is correct? Method A is radiation and Method B is conduction. Method A is radiation and Method B is convection. Method A is conduction and Method B is radiation. Method A is convection and Method B is radiation.
The radiations are basically electromagnetic radiation that does not required any medium to travel. They can travel not through air and solid material but can travel through vacuum.
Convection:
The convection is method of transfer of heat through liquid or gaseous medium.
<em>Summary:</em>
As in method one, there is no medium, so radiation can pass without medium
As in method two, there is liquid or gases medium, so heat travel through this medium will be convection.
Crossing over, or recombination, is the exchange of chromosome segments between nonsister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.
2. B It is the outermost layer of Earth, composed of solid rock and divided into sections called plates. 3. B The inner core is kept solid by the intense pressure of all the layers above it.
