Answer:
An electron in an excited energy level of an atom will always drop to lower energy levels, emitting very specific wavelengths of light in the process.
<h2>Answer:</h2>
Because cell structure is not uniform from every side and in every section.
<h3>Explanation:</h3>
A cell is a unit of life and it contains all the structure which are important for the functions of a life.
Cell contains nucleus for genetic material storage and replication. It contains mitochondria for respiration and ribosomes for protein production. Apart from these structures it contains golgi apparatus, endoplasmic reticulum, lysosomes and cell membrane. Except cell membrane their structures are not uniformally distributed.
That's why biologists often cut several sections from a cell to find out about its structure.
DNA because it tells each organelle their functions.
If there wasn't biodiversity, a disease could easily wipe out all of one species. If there was only one species, the survival rate would be very low.
