A great number of people, all people who eat meat use animal cells to live.
There are many reasons why people use animals for testing. One reason is that they don't want to risk killing a human.
sperm and eggs.
Animal cells use organelles (so do plant cells). Cells with organelles are called "eukaryotic" which means these are cells that have a nucleus (which is one of the organelles).
Eukaryotic cells have a distinct nucleus that contains their genetic material, like those found in animals and plants.
It can be dangerous for people and animals to use.
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They use a microscope
Unfortunately, yes. A good many pet dogs and cats become test animals in labs.
There are quite a few uses of animals that people have for them. People use animals for transportation and food.
Yes they are for good use because they use them for breeding,for food and for cloths. People tame these animals for alot of things.
Because there aren't many animals to find so they use them for their sleds
Most definitely people do determine land use. Animals have very little say in the matter.