Convection is the movement of material that distributes heat in the Earth's mantle. What arrangement of material may lead to convective motion?
OA.
mixed material with a uniform temperature
ОВ.
denser material on top of less dense material
OC.
mixed material with a uniform density
OD
less dense material on top of denser material

oceans

indian ocean

pacific ocean

atlantic ocean

arctic ocean

southern ocean

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

answer///unconditioned stimulus;