Answer:
- In claustrophobic laboratory a dog is forced to breathe tobacco smoke.
- In another lab, a rat is squeezed into a narrow glass tube and forced to breathe in tobacco smoke.
Both of these sentences hook to draw the reader's attention.
These are such cruel acts done by scientists, action shall be taken against such insane work. Tobacco is so damaging to humans, then just imagine its consequences on these poor animals. Bioethics rules shall be kept in mind before doing such cruel acts.
The best answer is b - experiment.
An organized process that is used to gather and analyze observations and test a hypothesis is an experiment.
An experiment is the fourth step in scientific method after observation, question and hypothesis.
An experiment is a test that is carried out under controlled conditions with the purpose of demonstrating a known truth, determine the efficacy of a yet untried thing or to examine the validity of a hypothesis.
A hypothesis is a proposed solution for an occurrence that is still unexplained and which does not fit in current accepted scientific theory.
Because your smell receptors are the most exposed part of your brain.
There are three major types<span> of blood vessels: the </span>arteries<span>, which carry the blood away from the heart; the </span>capillaries<span>, which enable the actual exchange of water and chemicals between the blood and the tissues; and the </span>veins<span>, which carry blood from the </span>capillaries <span>back toward the heart.</span>
