"Then I'm going to depend on you for some straight answers," Brion said. "This is an un-standard operation, and the standard techniques just don't begin to make sense. Even Poisson Distributions and Pareto Extrapolations don't apply here." Stine nodded agreement and Brion relaxed a bit. He had just relieved himself of his entire knowledge of societics, and it had sounded authentic. "The more I look at it the more I believe that this is a physical problem, something to do with the exotic and massive adjustments the Disans have made to this hellish environment. Could this tie up in any way with their absolutely suicidal attitude towards the cobalt bombs?"
"Could it? Could it?" Dr. Stine paced the floor rapidly on his stocky legs, twining his fingers behind his back. "You are bloody well right it could. Someone is thinking at last and not just punching bloody numbers into a machine and sitting and scratching his behind while waiting for the screen to light up with the answers. Do you know how Disans exist?" Brion shook his head. "The fools here think it disgusting but I call it fascinating. They have found ways to join a symbiotic relationship with the life forms on this planet. Even a parasitic relationship. You must realize that living organisms will do anything to survive. Castaways at sea will drink their own urine in their need for water. Disgust at this is only the attitude of the overprotected who have never experienced extreme thirst or hunger. Well, here on Dis you have a planet of castaways."
Stine opened the door of the pharmacy. "This talk of thirst makes me dry." With economically efficient motions he poured grain alcohol into a beaker, thinned it with distilled water and flavored it with some crystals from a bottle. He filled two glasses and handed Brion one. It didn't taste bad at all.
"What do you mean by parasitic, Doctor? Aren't we all parasites of the lower life forms? Meat animals, vegetables and such?"
"No, no—you miss the point! I speak of parasitic in the exact meaning of the word. You must realize that to a biologist there is no real difference between parasitism, symbiosis, mutualism, biontergasy, commensalism—"
"Stop, stop!" Brion said. "Those are just meaningless sounds to me. If that is what makes this planet tick I'm beginning to see why the rest of the staff has that lost feeling."
"It is just a matter of degree of the same thing. Look. You have a kind of crustacean living in the lakes here, very much like an ordinary crab. It has large claws in which it holds anemones, tentacled sea animals with no power of motion. The crustacean waves these around to gather food, and eats the pieces they capture that are too big for them. This is biontergasy, two creatures living and working together, yet each capable of existing alone.
"Now, this same crustacean has a parasite living under its shell, a degenerated form of a snail that has lost all powers of movement. A true parasite that takes food from its host's body and gives nothing in return. Inside this snail's gut there is a protozoan that lives off the snail's ingested food. Yet this little organism is not a parasite, as you might think at first, but a symbiote. It takes food from the snail, but at the same time it secretes a chemical that aids the snail's digestion of the food. Do you get the picture? All these life forms exist in a complicated interdependence."
Brion frowned in concentration, sipping at the drink. "It's making some kind of sense now. Symbiosis, parasitism and all the rest are just ways of describing variations of the same basic process of living together. And there is probably a grading and shading between some of these that make the exact relationship hard to define."
"Precisely. Existence is so difficult on this world that the competing forms have almost died out. There are still a few left, preying off the others. It was the cooperating and interdependent life forms that really won out in the race for survival. I say life forms with intent. The creatures here are mostly a mixture of plant and animal, like the lichens you have elsewhere. The Disans have a creature they call a "vaede" that they use for water when traveling. It has rudimentary powers of motion from its animal part, yet uses photosynthesis and stores water like a plant. When the Disans drink from it the thing taps their blood streams for food elements."