if this is true or false its true hope i helped
1) d
2) b because the independent variable is the thing you change/control in an experiment
3) c because the dependent variable is the thing being measured in an experiment
4)hmm it might be d, as c and a are both correct as different sized feeders would make it an unfair test and different types of food would as well
5) c
6) a
7) b obviously because if he activated them at different times then the ones activated last would have an advantage
Nitrogen and oxygen are in unpolluted air
Answer:
B
Explanation:
Atomic # = Protons
it says 4 p in the inside of the orbital
