Do animals have only one navigational system?

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Gas exchange system in all animals: materials do not flow only in one direction?

Can someone tell me some animals in whose gas exchange (I guess respiratory) systems the materials do not flow only in one direction? I for a split-second thought that materials flowing only in one direction is a common trait of the gas exchange system...

Answer:

In many aquatic organisms, mainly bony cartilaginous fish, they have a system in which water and blood...

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Answer:

animals have two navigational systems. magnet use, and developed ultranomia.

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The development of a one way digestive system was important to the evolution of animals because it gave...

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Answer:

Both cows and fish have very primitive digestive systems

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Answer:

Simple animals such as earthworms were the first - suck soil into the mouth with the pharynx.

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Answer:

i dont know / maybe the human system is better and that why the plant are still rooted in the ground...

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What is your attitude towards animals? (See description.)

According to Dr. Stephen Kellert, there are 10 categories of people's attitudes towards animals. Under which category do you fall? (NOTE: Most people fall into more than one category.) 1. NATURALISTIC. Interest and affection for wildlife and the outdoors...

Answer:

I'm definitely 1-4.

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How is the Equal Money System the same and how is it different from Communism and Marxism?

It seems some of the core tenets are very similar to a generic branding of Communism and Marxism. Perhaps this is an unfair view, but to an outsider, the things I read about it remind me of these systems. Can someone explain this to me? From Wikipedia...

Answer:

The equal money system is different to all past/existent systems be...

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