List any three adaptive features evolved in parasites enabling them to live successfully on their hosts.

List any three manures.

Explain co-evolution with reference to parasites and their hosts. Mention any four special adaptive features evolved parasites for their parastic mode of life.

List three flight adaptations in the body.

List any three ways of measuring population density of a habitat.

Water is very essential for life. List any three features that enable plants and animals to survive in waterless environment.

List any three important characteristics of population and explain them.