Answer:
In a census, data about all individual units (e.g. people or households) are collected in the population. In a survey, data are only collected for a sub-part of the population; this part is called a sample. These data are then used to estimate the characteristics of the whole population.
Explanation:
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Foods rich in calcium are dairy products such as milk, cheese and yoghurt. Other foods include almonds, dark leafy greens, seeds like poppy, sesame, celery and chia, beans and lentils and sardines. All these foods are good for the bones and will help decrease the risk of developing osteoporosis.
Answer:
positive energy are exactly balanced out by the quantum states of negative energy. As such, the net effect remains zero, and so we are unable to see or feel the effects of negative energy in normal everyday conditions.
It's a fun, and interesting thing to do. It's a great help towards your community and you benefit in the end with people and working skills. It's also great if you need some extra curriculars for your college applications.