Which BEST describes trophic relationships in ecosystems?

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

[34 points awarded to the best answer, use facts and/or data] 1.) what's the likelihood of thunderstorms occurring in the state of maryland? {this question is for a project for science, use facts and/or data and explain why . 34 points to the best answer]

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient