The strong crystal structure of an ionic compound is one of the main reasons why ionic compounds have a melting point. a) high b) low c) moderate d) variable

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.