A. Organized Body Made of One or More Cells - Tim C.

Arachnids have two body sections, four pair of legs, and no antennae. They also have abdomen. Arachinads have eyes but terrible vision so they have hair to feel if the prey is near. A spider has built in silk in their body to produce webs. Spiders have Pedipalp to guide them when they are in the dark to know where they are going. They are also used to feel the prey. Chelicerae for Arachindas have the Adomen for storing eggs for female spiders.Spiders have fangs to kill or paralyze its prey. Some spiders such as trantulas have fangs that swing forward to stab directly to its prey. However most spiders have two fangs that swing inward to hold their prey. Spiders have Silk Glands to produce webs and are spun like fingers and are called spinnerets.
Spider's Body Parts

B. Obtain and Use Energy - Jacob S
The way arachnids obtain energy for themselves is by eating other bugs such as ants, worms, and flies, that come anywhere in the arachnid's line of sight. The spider can't chew there prey,so
whitebanded-crab-spider-eating-bee-fly-AWIN091209-216[1].jpgthey release enzymes into their bodies to help digest their prey. Scorpions get energy by killing their prey buy using a stinger they have on their back rear. They would sting the prey and release venoms into their body to kill them and then eat the remains. Ticks get their energy by latching on the prey and would start sucking the blood slowly from their body without them even knowing. Unlike Spiders and Scorpions, Ticks sucks the blood from the prey instead eating the whole body of the prey.
(A Whiteband Crab spider eating a Beefly)

C. Reproduce - Skye T

Arachnids attract a mate by doing a courtship dance that lure in their mate. The dance tells the female that the male wants to mate. After the courtship dance the arachnids mate. After they mate the male slowly backs away the male and female usally separate, but sometimes the female will attack and kill its mate. Now, not all Anthropods reproduce the same way. Sqorpoins have live birth. They don't mate the same way as humans though. Although, they do mate a similar way with male and female parts.

D. Grow and Develop - Skye T

The eggs fertalize for a cuple days or weeks before the female lays them. After she lays the eggs she wraps them in a protective layer of silk (as seen below).

E. Respond to Stimuli - Tim C

Arachnids have brains to feel nerve cells. They also have eyes to judge distances. Most spiders have 8 eyes, but spiders can have up to 12 eyes. However, some spiders don't have eyes. Arachnids such as scorpions have hair to feel if the prey is near, because they have terrible vision. Spider's features are hair. They are useful for feeling the ground to find their way back in the dark. They are also used for clinging on to their webs they produce.
Spider_Hair.jpg (Close up of a spider's hair)
F. Exchange Gases with the Environment-Jacob S

Arachnids exchange gases with the enviroment by using their lungs. Arachnids have a diffrent type of lungs than people and animals; they have book lungs. Book lungs are little rectangles that stack on top another inside the arachnid's body. Even though they have a different form of lungs, they still breathe the same way biol_02_img0189[1].jpgas people and animals.
(The type of lung that arachnids have)


  • Gilpin, Daniel. Centipedes, Millipidees, Scorpions & Spiders. Minnesota: Compass Point Books, 2005. Print.

  • National Geographic Society; Biggs, Alton, et al. Life Science. New York: Glencoe McGraw-Hill, 2002.

  • Otfinoski, Steven. Spiders and other Arachnids. Chicago: World Book, Inc., 2001. Print.

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    • Todd,Robert W. Life Science, New York, Holt, Rinehart and Winston,2001