What are the four main characteristics of Arthropods?

Question

list and describe please

Answer 1

Arthropods are characterized by the possession of a segmented body

with appendages on at least one segment. They have a dorsal heart and a ventral nervous system.

All arthropods are covered by a hard exoskeleton made of chitin, a polysaccharide, which provides physical protection and resistance to desiccation. Arthropods grow by shedding this covering in what are termed molts.

Answer 2

egg, larva, pupa, adult

Answer 3

this might help you

http://www.blackwell-synergy.com/doi/abs...

Answer 4

they have exoskeletons, the have atleast four legs I think. I am sorry but I just now forgot the others.

Answer 5

Holistic: Whole approach--looking at everything about people--studying people both culturally and physically--a general rather than a specialized approach.

Evolutionary: Studying people during all time periods from the distant past through ancient civilizations to the present.

Non-Western Emphasis: Studying and comparing people all over the world, emphasizing those non-Western cultures (Africa, Middle East, Asia, Australia, Oceania, Latin America, North American Indians, etc.) and ethnic groups that other disciplines tend to de-emphasize.

Fieldwork Method: Studying people mainly through fieldwork (participant observation), the first-hand study of people that requires an anthropologist to live where he/she is doing research, to learn the local language, and to become as much a part of the group as any outsider can.

Answer 6

insects-three body parts - a head, thorax, and abdomen

six jointed legs

two antennae to sense the world around them

an exoskeleton (outside skeleton).

crustaceans- Body:The body consists of three main parts: (1) the head, (2) the thorax, (3) the abdomen. There are no bones in the body. It has instead a hard exoskeleton and many jointed legs. Crustaceans also have the power of regeneration if they lose a limb. During the next molt, the lost limb may appear in a reduced size, which will grow with successive molts.

Movement:Most crustaceans crawl across the bottom of the ocean. Some, however, have sets of swimmerets that allow them to swim through the water. A few crustaceans, such as barnacles, attach themselves to solid, underwater objects, and remain sessile.

Feeding:A few species of crustaceans may be parasitic, but most prey on various other marine animals or eat the remains of other organisms as scavengers. Smaller species, like copepods, drift through the water and feed off microscopic plankton.

Reproduction:Crustaceans reproduce sexually. The male deposits sperm either on the females shell or into her abdomen, where the eggs are then fertilized. In most species, the female then carries the fertilized eggs in her abdomen in order to protect them until they hatch.

Gas Exchange:Most crustaceans breathe through gills, pushing water over the gills to intake oxygen. Some small species, however, breathe through their skin rather than gills.

Human Connections:Crustaceans effect humans because they also serve as a large portion of the fishery

business throughout the world.  The seafood business creates many jobs and at the same time allows humans to control the population of these organisms.

spiders- http://www.xs4all.nl/~ednieuw/Spiders/In...

scorpions-  http://en.wikipedia.org/wiki/Scorpion

centipedes-http://animaldiversity.ummz.umich.edu/si...