Yeast
I believe it has something to do with the expansion of the yeast. I'm assuming at least the top of the bread cooks to a crust, then cracks open when it's too brittle to expand as the inside heats up.
The presence of tiny holes in the dirt around your house could be caused by burrowing animals such as moles, voles, or insects like ants or beetles.
Having vertical (longitudinal) ridges on the fingernails refers to the presence of tiny raised lines or ridges that run up and down the length of the nail. Ridges are among the different kinds of nail abnormalities that can develop due to aging, nail injury, or underlying medical conditions.Many people notice an increase in vertical ridges of the fingernails as they age, and this can be a normal development. Aging has been described as the predominant cause of vertical ridges on the fingernails.Onychorrhexis is the medical term used to describe longitudinal ridges on the nails that often accompany brittle nails.
A black cat's nose is typically black or dark in color, moist, and smooth in texture. It may also have a slightly rough surface due to the presence of tiny bumps or ridges.
Yes, I have experienced the presence of tiny white bugs on my skin that bite.
Your finger tips.
Yeast
people who live on mountains generally live in tiny caves or under small ridges.
Yeast produces carbon dioxide when they eat which makes those tiny wholes in bread. As yeast produces the carbon dioxide the bread expands and with all the ingredients in the dough of the bread it creates the bread we eat.
colds and flues are caused by bugs and viruses and tiny little specs.
Dough of bread contains yeast. Yeast reacts with sugar to give water and Carbon Dioxide (CO2). After baking CO2 escapes from dough which makes holes to bread.
dirt, little bread, tiny bit of water, and scraps.