The probability of two independent events occurring together is the Quotient of the probability of each event occurring separately.
        
                    
             
        
        
        
The diagram is missing in the question. It can be found in the following link: <em>https://quizizz.com › admin › quiz › 566b055c5cbcd49e2dd0fed1 › earth.</em>
The fossil evidence found in these sedimentary layers best implies that animals evolved bony skeletons after shells
Explanation:
Fossil is not only describing when organism lived, but it also gives information about the “progression and evolution of life” on this earth over millions of years. Fossils also give information that previous life in earth is different from present life. 
According to evolutionist around 500 million years ago complex internal skeleton organism came into existence. They told fish had firstly evolved and they dominated the sea. Fossilization is very rare process.
 
        
                    
             
        
        
        
The physical expression of genes are phenotype. Phenotype is the expression of the gene by the appearnace of the organism. It is the characteristics of that trait.
Examples : When pigment is made in our eyes, height ( tall and short) , weight, blond hair is the phenotype for the blond hair genotype and skin colour( black, white ) is the phenotype trait.