Answer:
The objective itself is usually a cylinder containing one or more lenses that are typically made of glass; its function is to collect light from the sample.
Explanation:
A telescope mirror can be made from glass that is somewhat less pure than that used to make a lens, since light does not pass through it.
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Tumor cells are cells that divide relentlessly, forming solid tumors or flooding the blood with abnormal cells.
Since the aphotic zone does not recieve sunlight it relys on the photic zone for the sunlight which in terms it does penetrate.
It became clear in the 1970's
The origins of replication (ori). eukaryotes: lots of oris. prokaryotes: one ori
