Which of the following is a cost of mining aluminum from new bauxite
deposits?
a. it requires a large amount of energy.
) b. it can be recycled over and over again.
c. it takes less energy to transport this lightweight metal.
d. it preserve plants and animals in rain forests.

answer; i believe the correct answer is (a)0

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: