Which of the following statements about human society and limiting factors is true? a. Modifications made to the environment to reduce the impact of limiting factors can cause disruption to the natural balance of an ecosystem. b. Humans cannot modify their environment to adapt it to their needs. c. Humans can completely overcome the factors that limit population size. d. Limiting factors are of no concern to human society, because they do not affect human populations. Please select the best answer from the choices provided A B C D

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

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.