The answer will be b. membrane.
Answer: monki says d
Explanation: monki big brain oof
Ionic compounds. because when in solid form they are held firmly in place therefore they cannot move to conduct electric current.
Answer:
Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities. It tends to occur more often in summer, because that is when we have the most sunlight.
Explanation:plz markk as brainliest