Answer:
In animal field studies, why do scientists usually try to work without making the animals aware that the humans are present? It is necessary to observe the animals without disturbing them. When a controlled experiment is not possible, why do scientists try to identify as many relevant variables as possible?
An earthquake is the sudden release of energy from the crust of the Earth, that results in a seismic wave. Using a seismograph, the interior of the Earth is mapped, finding the epicenter (origin) and magnitude (strength) of the quake.
A fruit...............................
The color of a star is primarily determined by its surface temperature.
For example, the really hot stars, called White Dwarf stars, have a white surface temperature, while a cooler star would have a more red color.
