All living creatures are classified into systems and sub-systems based on their similar characteristics. They are divided from bigger groups into smaller groups based on the detail of their similarities i.e. how they look, move, reproduce and how they relate to each other. A practical way of understanding the classification of living organisms is that organisms are linked to other similar organisms via family trees. The classification of all living creatures includes at least four levels: order, families, genus and species.
It has more similarity to fossils in layer A than layer D.
The crayfish have its nerve cord on the ventral side rather than on the dorsal side. The ventral side is under the Crayfishes' exoskeleton, as opposed to the dorsal side where the exoskeleton is . If it is attacked it will be from the dorsal side and the nerve cord would be snapped easier. The function of the nerve cord is that if it gets attacked by a predator they will go for the top and it will still be able to move.
When a warm air mass is caught between two colder air masses - cool temperatures and large amounts of rain or snow. When a cold air mass meets a warm air mass and remain separated. Brings<span> many days of cloudy, wet </span>weather<span>. ... </span>Brings dry<span>, </span>clear weather<span>.</span>
