The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrates. The plasma membrane protects intracellular components from the extracellular environment. The plasma membrane mediates cellular processes by regulating the materials that enter and exit the cell.
Members of the Shudra caste, for example, are relegated to performing hard physical work regardless of their skill, intelligence, or ambition. Those born into the Brahman caste must attend university or become a member of the clergy, even though they may show no interest or aptitude toward that end.
Many communities experience social exclusion, such as racial (e.g., black) (e.g., Untouchables or Low Castes or Dalits in Indian Caste System) and economic (e.g., Romani) communities. One example is the Aboriginal community in Australia. Marginalization of Aboriginal communities is a product of colonization.