Energy eventually flows out of the biosphere as HEAT
so c
If you tested more than one variable at a time, you wouldn't know if the result came from the first variable or any of the others. If you test one, you would know what that one variable did.
Answer:Any planet is an extremely faint light source compared to its parent star. For example, a star like the Sun is about a billion times as bright as the reflected light from any of the planets orbiting it. In addition to the intrinsic difficulty of detecting such a faint light source, the light from the parent star causes a glare that washes it out. For those reasons, very few of the exoplanets reported as of April 2014 have been observed directly, with even fewer being resolved from their host star
Explanation:
The macromolecule that controls body temperature and absorbs vitamins is lipids