Cell, Tissues, Organs, Organ Systems, Organism (Multicellular).
This is from the smallest component to largest components that make up a human organism.
Animal testing is inhumane and very unnecessary. There are so many different options available, There is no explanation for the poisoning, burning, and killing of about 100 mill animals each year causing them pain & fear. Animals are not little humans, and even tho we share a lot of our genes with other them the way our genes work is different.
"When water molecules escape from your frozen food, it is also possible for oxygen molecules to seep in. The oxygen molecules can dull the color and modify the flavor of your frozen product. Food that has freezer burn is safe to eat, but you may find the texture and taste not to your liking."
Source - https://www.loc.gov/rr/scitech/mysteries/freezerburn.html
It also loses the wall of the uterus
<span>Humans have an endoskeleton, whereas insects have exoskeletons.</span>
