What kinds of bonds can happen between the elements of a compound? a.
Ionic and Monogamous
c.
Dual and Chemical
b.
Covalent and Ionic
d.
Physical and Electrical

Please select the best answer from the choices provided

A
B
C
D

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

it would be d). more resources must be obtained to attain that combination of goods and services