Definition: This is a method of deducing the correct species assignment of a living thing. As the alternative name implies, it works by offering two (or sometimes more) alternatives at each juncture, and
the choice of one of those alternatives determines the next step.
Example: You can use one of these to unlock the identity of an organism.
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Term:

Dichotomous Key

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.