Cells that do a similar activity join together to shape body tissue, for example, muscle, skin, or bone tissue. Gatherings of various kinds of cells make up the organs in your body, for example, your heart, liver, or lungs. Every organ has own must do, however all organs cooperate to keep up your body.
The best answer to go with is b your welcome buddy
Genetic variation allows for a greater chance of a population surviving. For example, if a plant species acquires a disease, without genetic variation the disease would just keep getting passed on to the next identical organism and the population would decline and eventually die. But genetic variation prevents that from happening, because you have so many other species in the ecosystem, and genetic variation is a product of sexual reproduction meaning that the offspring of the diseased plant has a possibility of not inheriting the disease.
There are many ways to do this. You can either create a close approximation to what you think are the most relevant variables and hope your idea about the relevant variables was true.
Another way would be to do different kinds of experiments and hope you can deduce information from those experiments onto the subject that you would like to find an explanation for.
