The collared lemming is a small mammal that lives in the arctic tundra. Collared lemmings have white fur in winter and brown fur in summer. For most of the year, the arctic tundra is covered by snow. During this time, collared lemmings remain active in tunnels they make in the snow. The snow provides insulation and a place where the lemmings raise several litters of 3–5 offspring each year. The fur color of collared lemmings changes to white at a certain time of the year. 1. a. Explain how the change in fur color is an advantage to collared lemmings. When temperatures rise above freezing, snow melts, which causes changes in the collared lemmings’ habitat.

b. Describe two ways warming temperatures could cause the size of the collared lemming population to decrease.

c. Describe how fur color in the collared lemming population will likely change over time as temperatures increase because of climate change. Explain your answer using the principles of natural selection

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.

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.