lunes, 23 de julio de 2012

Science Investigation

The food chain

The Food Chain
Every living thing needs energy in order to live. Everytime animals do something (run, jump) they use energy to do so.

Animals get energy from the food they eat, and all living things get energy from food. Plants use sunlight, water and nutrients to get energy (in a process called photosynthesis). Energy is necessary for living beings to grow.
A food chain shows how each living thing gets food, and how nutrients and energy are passed from creature to creature. Food chains begin with plant-life, and end with animal-life. Some animals eat plants, some animals eat other animals.




 Food Web



food web is a graphical description of feeding relationships among species in an ecological community, that is, of who eats whom (Fig. 1). It is also a means of showing how energy and materials (e.g., carbon) flow through a community of species as a result of these feeding relationships. Typically, species are connected by lines or arrows called "links", and the species are sometimes referred to as "nodes" in food web diagrams.
Figure 1. Relationships between soil food web, plants, organic matter, and birds and mammals. (Image courtesy of USDA Natural Resources Conservation Service)


















Prey


where a predator (an organism that is hunting) feeds on its prey (the organism that is attacked).[





Predator

A group of elite warriors are hunted by members of a merciless alien race known as Predators.






Omnivores





Herbivores






Carnivores



















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