The blue-ringed octopus, shown below, utilizes a venom called tetrodotoxin as a defense mechanism. Tetrodotoxin binds to sodium channels and blocks the passage of sodium ions. Based on this information, which symptom would most likely occur in an organism exposed to tetrodotoxin? A. decreased appetite due to the production of hormones that indicate fullness B. increased heart rate due to increased nerve impulses to the heart muscles C. blindness due to proteins in the eyes denaturing and losing functionality D. paralysis due to lack of action potentials to signal muscle tissue Reset Next

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.