The High Plains have over 20,000 , that are important stopover habitat for migratory birds like ducks and geese.

Playa lakes.

Explanation:

A habitat can be defined as the natural living location or place of both living and non-living organisms. Some of the main components that makes up a habitat required for an organism to survive includes space, shelter, water and food.

Migratory birds refers to a group of bird leaving there natural living location or place in search of resources such as food and water in order to survive.

The High Plains have over 20,000 playa lakes, that are important stopover habitat for migratory birds like ducks and geese in search of scarce feeding resources which includes water and food. Playa lakes comprises of living organisms such as invertebrates, seeds and plants, that provides the optimum level of energy required by the migratory birds that are flying from one location to another.

Explanation:

charles darwin proposed thoery of natural selection.he had collected imnumerable specimens of plant and animals.he published concept survival of fittest. while explaining he says that There is always competition for food.only those organism survive which shows adptations in various reasons. it thoery of natural selection.

There are some objections,

1. natural selection is not only factor responsible for evolution.

2. darwin did not mention uesful and useless modifications.

3. There is no explanation about slow and abrupt changes