Well if you mean what does the controlled part of a scientific investigation, it is the part of the investigation that will be your control or your base, untouched, original, data and such.
Answer:
Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.
Explanation:
Answer:
Chan can use biodiversity as a tool by choosing different plants, animals and organisms for his research.
Explanation:
Biodiversity can be defined as the variety of life, which includes all plants, animals, humans, microorganisms, and much more. It includes all lifes and their interactions. Biodiversity is one of the most complex, as well as vital feature of our planet. A human depends a lot on biodiversity. The food we eat, the water we drink, the air we breath in, all depends on biodiversity. Like thatm it also contributes to a person's health. So Chan should study different organisms and their interaction with a huuman for his research.
Answer:
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