Answer:
The correct answer would be - using a lens that is too high powered and thus you may be too focused on the specimen.
Explanation:
The possible scenario for this case where the slide is in focus but can not see anything could be either specimen is not under the lense or too focused on the specimen by using a very high-powered lens.
In a very high-powered lens, the lens becomes over-focused and the specimen does not look in the field of view of the lens, in such case, an individual should ower the power of lense.
Answer:
the basic unit of a chemical element.
atoms as a source of nuclear energy.
It is very cold, and not always but usually when below freezing
I believe the answer is A.) Inside the nucleus, because in the nucleus there is DNA, RNA, and nuclear proteins. I hope this helps love! :)