Advancement in technology. For example, body odor on humans was considered attractive thousands of years ago. Now it's just considered a hassle and we try our best to get rid of the smell.
If a moving object loses mass, how can it keep its momentum constant?
A. by speeding up
Answer:
No. China is already consuming third of the world's coal production for electricity, which is a serious challenge to the environmental. The trade off is fair so China should build the new dam.
Pandemics occur over a wide geographic region, potentially affecting a large population.
Let's go through each of our options.
For A, the rarity of something has no effect on its validity.
For B, the study wouldn't be more valid, as you should only be testing one variable at a time (in the case, the medicine).
For C, nothing in your experiments should ever be random. And if I'm correctly interpreting it, the question means that even patients who aren't sick would be receiving the treatment, which serves no purpose at all.
Therefore, we know that D must be the correct answer, via process of elimination. Smaller sample sizes are not ideal for experiments, as they require a great deal of extrapolation to see more specific results on a larger scale.
