In epithelial tissue, what is this bottom layer called?

What feature of cell theory is best demonstrated in the image

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?