The graph above depicts the human population of the world from 1050 to 2050 (projected). With an ever increasing human population, we pose a threat to our own planet in many ways. In terms of sustainability, which of these is not vital to this population growth? A) the air quality is deteriorating B) our natural resources are depleting C) birth control policies should be strictly enforced D) the food industry can't keep up with the demand of a growing population

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.