A fossil species is found in the same rock layer with Fossil 3 and Fossil 4. When could this species have existed? A 500-245 MYA
B 500-500 MYA
C 540-254
D 540-505

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

there’s no image attached but i can if you want: )