New topic
Printable| Author | Message |
I'm still wondering about this one... an animal with gills that starts with an A....?
HELP ! | |
- E-mail - orgNote -  Report post to moderator |
Anne Coulter | |
| - E-mail - orgNote - Report post to moderator |
A....fish  | |
| - E-mail - orgNote - Report post to moderator |
Arthropods
This group found within the pond are often associated with crabs, lobsters andwater-lice.jpg (29104 bytes) shrimps. In fact this group includes spiders mites and insects. Its the largest and most successful group of animals on the face of the earth. Arthropodia means joint limbed animals, and they make up three-quarters of the total animals living in fresh water. Obviously with such a group that is so diverse we can only touch upon them within this page, but general characteristics apply in the majority. The commonest feature found in arthropods is the fact that they have paired jointed legs. They have external skeletons, which is a toughened layer called chiton: this serves to carry all the internal organs. This tough outer layer is what makes them so successful, but has a disadvantage. They are unable to grow with such a rigid structure and so must moult as they grow. Aquatic arthropods have devised many different ways to breathe, some having gills to extract oxygen from the water, others absorbing air through there skins, or even air tubes which are thrust through the surface to obtain their life giving air. So let's now take a look at a few examples from each group within this phylum. | |
| - E-mail - orgNote - Report post to moderator |
analbolique said: Arthropods
This group found within the pond are often associated with crabs, lobsters andwater-lice.jpg (29104 bytes) shrimps. In fact this group includes spiders mites and insects. Its the largest and most successful group of animals on the face of the earth. Arthropodia means joint limbed animals, and they make up three-quarters of the total animals living in fresh water. Obviously with such a group that is so diverse we can only touch upon them within this page, but general characteristics apply in the majority. The commonest feature found in arthropods is the fact that they have paired jointed legs. They have external skeletons, which is a toughened layer called chiton: this serves to carry all the internal organs. This tough outer layer is what makes them so successful, but has a disadvantage. They are unable to grow with such a rigid structure and so must moult as they grow. Aquatic arthropods have devised many different ways to breathe, some having gills to extract oxygen from the water, others absorbing air through there skins, or even air tubes which are thrust through the surface to obtain their life giving air. So let's now take a look at a few examples from each group within this phylum. analbolique said: nobody likes a smart arse
 | |
| - E-mail - orgNote - Report post to moderator |
AsianBomb777 said: Anne Coulter
 | |
| - E-mail - orgNote - Report post to moderator |
