13. Which structure is best observed using a compound light microscope? O the inner surface of a mitochondrion
O a cell
O a DNA sequence
O a virus

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

yes, because even though a theory has a  lot of evidence to support it, it is not always true

propane is burned to provide the heat in many cooking grills. the chemical reaction for this process is shown in the equation below.

c3h8 + 5o2 ? 3 co2 + 4h2o + energy

what are the products in this chemical reaction?

3co2 + 4h2o + energy