Ecology, Human Impact, and Evolution: Key Concepts
Ecology and Human Benefits
Ecology provides crucial information about the benefits of ecosystems and sustainable resource use for future generations.
- Improves our environment by addressing poor water quality and pollution.
- Helps manage natural resources, including endangered species protection and forest management.
- Protects human health through processes like marshes and wetlands filtering toxins, and biomedical applications of plants and animals.
Human Activities and Ecosystem Impact
Human activities
Migration in Spain: Internal, External, and Immigration
Migratory Movements
Migration is the movement of people in space. Emigration is moving out of a place. Immigration is the opposite. The difference between them is net migration, which can be positive or negative.
Internal Migration
Internal migrations take place within the borders of a country. These may include:
- Temporary: Whose duration is limited. Previously associated with agricultural work such as transhumance and certain tasks in the collection.
- Final: The rural exodus is the massive displacement
World Population and Migration: Trends and Factors
World Population: Trends and Factors
World population refers to the total number of inhabitants. Population density is the relationship between people and surface area. Areas can be classified as:
- Sparsely populated: About 10 inhabitants/km2
- Moderately populated: 50-80 inhabitants/km2
Population evolves through several factors:
- Birth rate: The number of births in a population.
- Fecundity: The average number of children a woman is expected to have.
- Mortality: The number of deaths in a population.
- Migrations:
Cordoba’s Islamic Legacy: Art, Mosque, and Madinat al-Zahra
Art and Architecture of Islamic Cordoba
The Caliphate
In 750, the Abbasids moved the capital from Damascus to Baghdad. In the same year, they defeated the Umayyad family, killing all their princes except Abd Al-Rahman I. In 756, Abd Al-Rahman I fled, taking refuge in North Africa, and arrived in Cordoba, establishing the independent emirate. This involved significant conquests. In 929, Abd al-Rahman III proclaimed himself caliph, marking a golden age for Al-Andalus. Cordoba became the most populated
Read MoreGenetic Resources: Conservation and Classification
Genetic Resources: Types and Conservation
Since the nineteenth century, there has been a significant scientific breakthrough in the breeding and selection of cultivars and breeds. This has left aside many forms, and today, agriculture and livestock genetics rest on a very restricted base. There are five categories of genetic resources:
- Wild relatives: Share common ancestry with domesticated species but have remained wild. They have a very broad genetic base.
- Primitive races and cultures: Local varieties
Understanding the Tertiary Sector and Trade
Tertiary Activities
The tertiary sector is the economic sector that includes activities that do not produce material goods but serve the population.
The Diversity of the Services Sector
This sector encompasses a wide range of activities. The maximum expansion of the tertiary sector has been reached with the information society, which has produced scientific and technical development, to the point of being called the “tertiary revolution”.
The Upper Tertiary or Quaternary Sector
The tertiary sector continues
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