State metamerism in annelids.
Write three basic characters of an Arthropod
Answers
Metamerism is a body type exhibited by members of the phylum Annelida. It means that the body is composed of repeating segments attached to make a whole. These segments are known as metameres, and the lines we see externally separating each segment are called annuli. Metamerism is easily visible in earthworms.
Arthropod Characteristics
Characteristics shared by all arthropods include:
1.Exoskeletons made of chitin
2.Highly developed sense organs
3 .Jointed limbs (the limbs must be jointed like the joints in a suit of armor, since the exoskeleton is rigid and cannot bend to allow movement)
4.Segmented bodies
5.Ventral nervous system. “Ventral” means “in front,” so this means that arthropods’ nervous systems run along the front of their bodies, near their stomachs, instead of along their backs like the spinal cords of animals.
6.Bilateral symmetry. This means that the left and right sides of an arthropod are the same – it will have the same number and arrangement of legs, eyes, etc. on the right side of its body as on the left