That is false because every type of plastic can biodegrade
To increase the rate of a reaction, you can either do any of the following:
-increase the temperature
-increase concentration of the aqueous reactant
-increase pressure of the gas
-use a catalyst
-increase surface area of the solid reactant
From these, the engineer should therefore do C. Adding a catalyst speeds up the reaction without really joining the reaction.
A flight simulator that helps astronauts prepare for a shuttle launch is an example of a Scientific Model.
An electron number higher than the proton number I think
It's called frequency, its usually stated Hertz
