20.4 21.3 are the correct answers
Carbon atoms have 4 valence electrons. That allows them to make 4 covalent bonds. That means they can make really big molecules. All the organic molecules have Carbon in them.
Ok so basically this seems more complicated than it is
We want to start with coming up with <u>three traits</u> say your "living thing" will have...
let's use some simple traits that we know and have seen in other animals
(I'm using a cat-like animal in reference)
Ear size: Large, Small
Fur color: Grey, Black, Grey with Black, Black with Grey
Now let's take a look at the chart
Hope This is Helpful!