Phylum Arthropoda

Horseshoe crabs dont have jaws instead they use there 5 legs to guide the food particles into there mouth and use there gizzards to grind the particles up using sand and gravel in the process
Spiders have regular jaws which they use fangs to pierce there prey and inject venom into them

18,750 or around 15% per year

200 meters below the ocean surface and they have lived for 445 million years

Subphylum Crustacea- horseshoe crabs
Subphylum Cheilcerata- Spiders

overall they have 10 eyes 2 large eyes on their dorsal, one eye on their tail, and the other 5 underneath their body

In eel and conch fisheries they fish for horseshoe crabs for bait and migratory Shorebirds depend on horseshoe crab eggs for their main food source before they migrate to Arctic breeding grounds. and if there is no more horseshoe crabs to lay eggs that means shorebirds will die as well

after they are maturely developed which takes ten years they come back to the beach to spawn and lay 4,00 eggs

Class Merostomata
Class Cheilcerata
Limus Polyphemus

Horseshoe crabs mutated amebocyte cells that includes cogulogen proteins that attack the bacteria and form a jell that prevents them to grow and reproduce and eventually kills it. And humans only have white blood cells than kill infections
Oxygen is bound to hemocyanine a molecule that contains copper which gives the blue blood coloring in horseshoe crabs.
In humans oxygen is bound to the hemoglobin a molecule for iron which gives the red blood color

The copper blood is the fastest way to test pharmaceutical drugs for the presence of bacteria. The LAL stands for Limus amebocytes Lycate

They have an open circulatory system which means the blood flows freely through the body cavity if
Bacteria gets into their blood they would die this began the process of natural selection they
Mutated an amoebocyte cell that could kill and detect bacteria instantly like white blood cells in humans but can are able to detect endotoxins unlike white bloods cells can