the answer is a because if the model is based on experimental data it wont be good unless it has been tested.
I think that the question is not clear enough. Can you be more specific?
If your question was something like this: how many atoms of hydrogen can be around carbon, then the answer is 4. Carbon forms 4 bonds with other atoms.
Please note that carbon need not always form bonds to four atoms. A carbon could form a double bond with an oxygen and then two single bonds to hydrogen atoms. The carbon is only bonded to three atoms, but is forming a total of four bonds (1 double and 2 singles).
Phylogeny has to do with the history of the evolution of a species or a group, usually represented in the form of a phylogenetic tree. Since it studies evolution, it is only natural it could give us some kind of reliable information about the existence of life on Earth and how it all came to be.
Answer:variables
Explanation:are not charging simultaneously
