Answer:
D a photograph
Explanation:
because it help to know what happened through the help of picture. it also help to increase memory power..
Convection occurs in fluids (so both liquids and gases, as well as rheids) and is the concerted, collective movement of groups or aggregates of molecules within the above through advection or diffusion or both at the same time. Convection can never take place in solids and is only specific to fluids.
A , the out back , this is the answer e out back for us is also known as the country
The outer core is more thinner than the inner core. outer core is also more rocky in material.
As my memory serves me well, innovations like the production of gunpowder, tea, and silk are usually attributed to D. China
