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1) Vaccum your house weekly.
2) Don't drop food crumbs on the floor. If you do, then sweep it immediately.
3) Clean your backyard well too, remove the weeds etc.
4) Wash the floors with water & soap weekly too.
There are different kinds of persons and one type is composed of those who work well alone while other would prefer to work in the group. If the group is large enough so that it is just conducive for learning then, it will be helpful to the dynamics. However, if it is very big that it is no longer healthy then, it would be better to divide further the group.
The change in temperature is greater when the water is heated with the use of the fire caught by the food substance, then the energy content in the food substance is higher because the heat energy is greater, since the heat energy is absorbed by the water when the fire is kept under the test tube containing water. The formula indicates that if the change in temperature is greater when the mass of the substances and the volume of water are constant, then the heat energy is higher.