Issues and Needs in Science identified by the USGS as being connected to agricultural practices' environmental impacts are as follows:
Effects of habitat fragmentation and changing land use on animals.
Juggling competing water demands from the urban and agricultural sectors.
Interactions between surface water, subsurface water, and air that have an impact on water quality.
Water quality effects of irrigation, drainage, and return flow in agriculture.
The creation and application of cutting-edge farming methods to preserve soil and water and enhance water quality.
Genetically modified creatures' effects on naturally occurring species and environments.
Rapid assessment methods and tools for locating agricultural contamination sources.
Impacts of pesticides, fertilizers, and sediments on the habitat quality and health of fish and wildlife.
Effects of soils, riparian forests, and wetlands—characteristics of watersheds—on nutrient uptake, retention, and cycling.
Endocrine disruptive substances, veterinary medications, feed additives, hormones, and infections are transported across terrestrial and aquatic ecosystems and ultimately end up there.
In this question, there are no options given to choose from. So i would answer this question based on my knowledge. The most likely cause of the observed variation is adaptation and evolution. The birds of that island adapted to the food source and then they evolved as per the requirement of the place and food source.
Answer: Stimulus is something that causes a reaction, either positive or negative in the body of an organism. Examples includes, HEAT, COLD, PRESSURE, PAIN
