Which of the following correctly shows how energy flows through a food chain? A Sun → carnivores → producers → herbivores B. Sun > producers → herbivores → carnivores
С Sun → herbivores > carnivores producers
D Sun → producers → carnivores → herbivores

i do not get it   at all

c) should be the answer.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.