Which of the following is an example of competition that could be found in the ocean?
a lack of sunlight due to changes in the seasons restricts the growth of certain plants
b plentiful oxygen leads to an increase in the number of reefs
c two sharks populations utilize the same fish population as their main food source
d algae blooms decrease as the number of fish increase

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.