Q1) Describe three ways food chains can be disrupted

Explanation:

Causes for Disruptions in the Food Web

Overpopulation.

Water pollution.

Acid rain.

Climate change.

Air pollution.

Illegal hunting.

Soil pollution.

Illegal dumping.

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.

the statements that apply here about binary star system are

"have stars that might appear to wobble"

"often have one star that is brighter than other"

a binary star is a star system consisting of two stars revolving around their common barycenter. systems of two or more stars are called multiple star systems.