2. It took 6 minutes for the altitude of the balloon to go from 200m to 400 m. What was the rate of change of the balloon?

Glutamic acid: hydrophilic or hydrophobic? positive, negative, or neutral? valine: hydrophilic or hydrophobic? positive, negative, or neutral?

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

I’m stuck on this question cuz i’m stupid sksksksk