what clathrate was so I looked it up and came up with the following explanation

clath·rate (klàth¹rât´) adjective
Biology. Having a latticelike structure or appearance: clathrate foliage.
noun
Chemistry.
A clathrate compound, such as urea.

The meaning of the word UREA was also of interest, so again I looked up the word in the dictionary.

u·re·a (y¢-rê¹e) noun
A water-soluble compound, CO(NH2)2, that is the major nitrogenous end product of protein metabolism and is the chief nitrogenous component of the urine in mammals and other organisms. Also called carbamide.

[New Latin, from French urée, from urine, urine, from Old French, from Latin úrìna. See urine.]

u·rine (y¢r¹în) noun
The waste product secreted by the kidneys that in mammals is a yellow to amber-colored, slightly acid fluid discharged from the body through the urethra.

[Middle English, from Old French, from Latin úrìna.]

From this information then I can deduce that there are some enormous animals on Mars that walk in straight lines and relieve themselves every now and then. ;-)
If there is no other life on the planet, then captain Kirk’s assurance that ‘carbamide’ is the most destructive force in the universe is only partly correct. ;-)

Of course I could be wrong, but then it is easy to be misled if you are not familiar with the subject matter.

Cheers: Johannes