Which of the following is not one of the four spheres that Earth's life-support system is based on? A. Atmosphere
B. Biosphere
C. Geosphere
D. Hydrosphere
E. Exosphere

(Just checking over the answer )

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

the answer is c on e2020, bud.

what is this saying?

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.