Smooth, rounded characteristics such as large eyes, fat cheeks, and a large head (i.e. babies) is very appealing to humans and other species (the way we call it "cuteness") which is a stimuli that promotes caring of babies and young children. This is also the same principle why humans find puppies, kittens, and other baby animals cute and want to care for them.
Diffusion.
Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.
A. The bacteria living inside the intestines of a rabbit. Biotic creature are things that are living, breathing, and need food/water to live. Hope my answer was useful. <span />