John loves trout fishing so much that he goes trout fishing several times throughout the year. he began to notice that during the dry season the trout had significantly more lice on them than during the rainy season. john, a curious science student, wanted to find out what was causing the increase of lice on the trout. write a testable hypothesis to john focus his research

What is one affect on the australian environment due to the introduction of non-native european rabbits? (a) more grass grew in response to the need of the growing population of rabbits. (b) the rabbits balance out the food chain as they became a natural prey to many predators. (c) the rabbits the land by digging, which caused the soil to spread much needed nutrients. (d) the rabbits out-competed other small animals species and caused them to go extinct.