The use of isotopes is used to track molecules in many biochemical pathways such as photosynthesis. The use of the heavy isotope of oxygen-18 can be used to track the passage of oxygen through the process of photosynthesis. Where would you expect to find the heavy isotope of oxygen-18 if the water initially contained the heavy oxygen? Explain.

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.