Which answer correctly summarizes the essential elements of a scientific theory? A. eventually become laws; based on many tests and reviews; usually don't change
B. predict and describe;based on observation and logic; formulated before experimentation
C. never become laws; based on strong scientific support; many changes based on evidence
D. describe the natural world; based on many observations and data; do not explain why

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

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.