The circulatory system the body to remove waste when it carries oxygen to the muscles. carries carbon dioxide to the lungs. carries nutrients to the organs. carries hormones throughout the body.

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Most short-period comets do not have randomly oriented orbits because

What do we mean by the event horizon of a black hole?