Name three differences between Archaebacteria and Eubacteria.

Archaebacteria, eubacteria and cyanobacteria are the three domains of kingdom monera. Archaebacteria are called ancient bacteria whereas the eubacteria are called true bacteria. Eubacteria are usually found in soil, water, living in and on of large organisms. Eubacteria are divided into two groups known as gram positive and gram negative bacteria. Archaebacteria are found in salt brines, ocean depths and hot springs. They have evolved just after the evolution of first life on earth. Three types of archaebacteria are found: methanogens, halophiles and thermoacidophiles. The main difference between archaebacteria and eubacteria is their habitats in the environment.  

Explanation:

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

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