How would you determine if a tissue you are looking at could only be from a heart?

What is the function of nucleic acids

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

Actinobacteria sp. are fermenting organisms (which do you use oxygen to breathe) referred to as chemoorganohetereotrophs this means they break down organic material and convert it to inorganic material. which part of the carbon cycle does this describe