O2 (oxygen) is not needed for photosynthesis to occur.
A. The allele frequency of a population changes due to a bottleneck.
This is because genetic drift happens because of chances events such as founder effect of bottleneck effect
For starters, atoms are the basic building blocks of matter- they make up elements, molecules and compounds. Elements most often combine with other elements as compounds. Whilst molecules are particles found in both elements and compounds. I hope that wasn't too confusing, but bottom line is that they are all linked together in this way! Helpful? :)
Answer:
The field of view is widest on the lowest power objective. When you switch to a higher power, the field of view is closes in. You will see more of an object on low power.

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Microscope Notes
