The differences between open and closed circulatory systems
By: Effie Moore Salem
Open and closed circulation In humans and in the higher animals, the pulmonary group of arteries and veins are a closed system within the overall system; the overall system being referred to as an open system. It is not an open system, however, when being...
The differences between open and closed circulatory systems
By: Trenna Sue Hiler
There are two basic types of circulatory systems in animals that require blood be pumped through the organism to deliver oxygen and remove waste. There is an open circulatory system and a closed circulatory system.In the most simple terms the closed system the blood...
By: Perry McCarney
All lifeforms need some method of moving substances around within themselves. Single-cell organisms use methods similar to those used by the cells of the multi-cellular, the natural spread of molecules from areas of high concentration, a process called diffusion, being a major one. Most...
Understanding pig behavior
By: Diane Jaramillo
Understanding pig behavior is certainly a lot easier than understanding human behavior. There are a lot of myths about pigs, ranging from their supposed lack of intelligence (not true) to the belief that they are filthy creatures (also not true). Let's examine some of those...
Insects and their importance
By: Brenda Nelson
It might surprise you to know, but insects, those tiny pesky creatures capable of ruining a picnic, are more beneficial to the planet than are humans. Of all the known life forms currently on Earth, more than half are insects. Insects have been around since...
Insects and their importance
By: Jacquie Schmall
Although they exist in enormous numbers and variety everywhere in the world, taking on incredible forms and colors, insects serve humankind by accident, not by intention. But serve us exceedingly well they do. Insects are an essential part of building up, as well as breaking...
Insects and their importance
By: Gillian Taber
Why are insects important? The simple answer is that they are part of the food chain and are useful in pollination. Of course there is a great deal more to the subject but to cover the whole area would take a book. For the purposes...
What are fixed action patterns (FAP) in animals?
By: Tami Port MS
A fixed action pattern (FAP) is an instinctive behavioral response that is triggered by a very specific stimulus. Once triggered, the FAP behavior can't be stopped 'midstream', but must play out to completion.Fixed action patterns are produced by a neural network known as the...
Galapagos penguins: How they adapt to their environment
By: Khalaf Farid
Spheniscus mendiculus is the scientific name for the Galapagos penguin.It is the only penguin to live on the equator and one of the smallest penguins which average at the size of 48-50 cm and weight around 5.5Ibs. It is the only penguin ever...
Insects and their importance
By: Greg Spinks
Insects are amazing organisms; they are colorful, like the ancient dragonflies; some oddly shaped, like pre-historic walking sticks; some can fly, others crawl, a few skip and many sing; and thankfully, they are plentiful. Insects are vital in our natural world and in the...

 

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