1. Density. Calculate the density of a rock with a volume of 53cm^3 and a mass of 159g.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

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 

i think it is d. objects resist changes in their state of motion.