Adisease resulting in the deaths of one third of a dense population of bats in a cave would be a

A disease resulting in the deaths of one third of a dense population of bats in a cave would be a density-dependent limiting factor.

The density dependent factor are those factors whose affects on the growth or the size of the population can vary with the population density. Different sorts of density dependent limiting factors exist, for example: disease, migration, predation, availability of food. The last one mention is the main factor  that could result in death, for instance in the death of a population of bats.

supplies had to travel a long distance across water on ships that were often attacked, so they did not reach europe

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44