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Ecosystems

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Subido el 4 de noviembre de 2019 por Tic cp tirsodemolina colmenarviejo

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A review of ecosystems unit

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An ecosystem consists of the physical environment and all the living things that live in that 00:00:05
physical environment. 00:00:17
The physical environment is the non-living component in an ecosystem. 00:00:20
It includes non-living things like rocks, water and air, and also factors like temperature, 00:00:26
humidity and light. There are two types of physical environments, terrestrial and aquatic. 00:00:32
Aquatic environments can be fresh water, like rivers and lakes, or saltwater environments 00:00:40
like seas and oceans. The living things in an ecosystem are the bacteria, animals, plants, 00:00:45
fungi and protists living in it. You might have heard about the fauna and flora in an 00:00:53
ecosystem? Well fauna refers to the animals and flora refers to the plants. 00:01:00
All living things are grouped into species. A species is a group of similar 00:01:06
living things that can successfully reproduce for generations. That means 00:01:16
that if two organisms of the same species reproduce, like these two dogs, 00:01:23
they will have baby organisms like this little dog that will be able to 00:01:27
reproduce in the future. If two organisms of different species reproduce like 00:01:32
this tiger and this lion they will have a baby organism and that organism won't 00:01:39
be able to reproduce in the future. All living things in an ecosystem are 00:01:45
organized so organisms of the same species form a population, different 00:01:51
populations from a community and the community and the physical environment from the ecosystem 00:01:57
finally all living things on earth make up the biosphere but let's talk now about ecosystems 00:02:06
there are two types of ecosystems terrestrial and aquatic terrestrial ecosystems include forest 00:02:17
mountain grasslands and desert and steppes. Forests are ecosystems with many trees. 00:02:26
Those trees provide shelter and food for different animals. Two examples of forests are the Atlantic 00:02:35
Forest with a humid climate and the Mediterranean Forest with a dry climate. In mountain grasslands 00:02:47
plants are herbaceous, that means that they have soft and flexible stems. Grasslands usually have 00:02:56
fertile soil. Deserts and steppes are found in very dry regions with extreme 00:03:05
temperatures, so living things here need to be adapted to difficult conditions. 00:03:11
Aquatic ecosystems include marine ecosystems and freshwater ecosystems. 00:03:17
Water in marine ecosystems is in constant movement because of the 00:03:24
carbines, waves and tides. In marine ecosystems we find sandy beaches which are 00:03:28
affected by tides and waves. Crocusaurs are shallow areas with sunlight that 00:03:34
allows algaei to grow. Open sea is the deep sea far from the coast. Sunlight reaches 00:03:41
depth of about 100 meters so algaei cannot grow below this point. In fresh 00:03:47
water ecosystems we found rivers. In rivers the water is always moving so 00:03:56
and living things need to adapt to the flow. 00:04:01
We can also find lakes. 00:04:04
In lakes, water doesn't really move, 00:04:06
so some plants can grow here, 00:04:08
and those plants provide shelter for birds 00:04:11
and other little animals. 00:04:14
And now we have a general idea of what ecosystems are. 00:04:17
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  • Educación Primaria
    • Primer Ciclo
      • Primer Curso
      • Segundo Curso
    • Segundo Ciclo
      • Tercer Curso
      • Cuarto Curso
    • Tercer Ciclo
      • Quinto Curso
      • Sexto Curso
Subido por:
Tic cp tirsodemolina colmenarviejo
Licencia:
Todos los derechos reservados
Visualizaciones:
9
Fecha:
4 de noviembre de 2019 - 14:00
Visibilidad:
Público
Centro:
CP INF-PRI TIRSO DE MOLINA
Duración:
04′ 29″
Relación de aspecto:
1.78:1
Resolución:
1280x720 píxeles
Tamaño:
26.93 MBytes

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