The leading cause is garbage and waste from people.
<span>Im pretty sure the answer is B) Pupil, lens, retina, optic nerve
hope this helps :)</span>
<span>This variation be justified by:
</span>Migration to an environment different from their birthplace, and adaptation to the available food, ultimately leading to speciation. because <span>birds use their beaks to eat.</span>.
both plants and animals can if that helps. So any living being I think...
