In what part of the world is the mutation for lactose tolerance most concentrated?

Which describes how weathering and erosion are different? weathering is caused by water. erosion is caused by wind and ice. erosion transports sediments. weathering is a natural process.

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

One function of the immune system is to attack the foreign cells to protect the body. in organ translate , the body recongnizes that the new organ is made of foreign cells. wha kind of medicine would you give a patient to increase the chances of transplate success