Which method offers the MOST reliable way of assessing whether caffeine consumption boosts athletic performance?

naturalistic observation
experimentation
descriptive research
correlational studies

The earth's polarity has switched many times through history as evidence by what wh the earth clorets he has switched many times throughout history as evidence by what

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?