Answer:
used by scientists in classification
Explanation:
Classification is the orderly arrangement of organisms into groups based on their similarities biologically, morphologically and phylogenetically. Those with similar characteristics are put under the same group or taxon.
Answer:
i think its called aperture
It is very dark down there, it is so deep that it makes it hard for scientists to be able to survive down there, & there is not really any ready to use equipment since we don't know how it is down there.
The correct answer is complete.
<span>Valence
is the number of electrons an atom must gain or lose in order to complete
its outer energy level or have a stable octet in its outer shell.
In the first energy level it can have only 2, but later levels can have 8, that is, an octet.</span>