(twenty points)
of the resources below, which one is perpetual?
fish
coal
timber
tidal energy

D. Tidal energy

Explanation - Resources generally get exhausted if used endlessly and in large quantity. Resources that cannot be replenished are called as non-renewable sources like coal. Perpetual resources are those resources that are present abundantly or less likely to get exhaust even when used endlessly.

They are also called as renewable source. Example of perpetual resources are solar energy, tidal energy etc. Fish if consumed in large quantities might get extinct in near future.  

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )

that scientist would be robert hooke