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Plants and Animals each have different system boundaries.
In plant cell contains a cell wall and a cell membrane while an animal cell only contains a cell membrane.
These help the cell by acting as a filter (i.e. They let some through while they prevent others from coming in.)
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The Linnaean system added more stories onto hierarchy the of complicatedness that Aristotle developed.
The Linnaean system of type of taxonomy was developed by Swedish naturalist named Carolus Linnaeus in the mid 1700. He created a way to organize and name species. He based his type on physical traits of organisms and uses binomial nomenclature to identify organisms. The seven main level of classification are kingdom, phylum, class, order, family, genus and species.
<h3>Why is the Linnaean system important?</h3>
The Linnaean system is critical because it led to the use of binomial nomenclature to recognize each species. Once the system was assumed, scientists could communicate without the use of deceiving common names. A human being became a partner of Homo sapiens, no matter what terminology a person spoke.
To learn more about Linnaean system, refer
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Crayfish are invertebrates which means they don't have a backbone. They are also arthropods, which means that they have a protective exoskeleton on the outside of their body. Other arthropods include insects, spiders, and centipedes. Crayfish continually shed their exoskeleton and regrow a new one. During this transition is when they are most vulnerable to predators because they aren't protected by their outer shell.
Crayfish are found all over the world in many different freshwater environments, such as rivers, creeks, springs, and swamps. But this doesn't necessarily mean that you will be able to find them. They are somewhat cryptic because they dig out homes for themselves under rocks and blend in well with their environment. Crayfish will ardently defend this dwelling against intruders using their strong front claws