According to the graph, in 1900 the population of the industrialized countries made up about 33% of the world's population. By 2050 that percentage will have fallen to about A) 24% B) 18% C) 14% D) 10%

answer; ///(b) it is composed of four protein chains and four heme groups;

a community that experiences major changes undergoes progress

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: