Explanation:
The role of active cytotoxic T cells is to attack <u> </u><u>body cells that have been infected</u>
Answer: 3.friction
Explanation: friction is a force of resistance acting between objects in contact and tending to dampen their motion
This could be two answers Water or Oxygen. I would go with water because it contains oxygen therefore making it a possible answer. Hope I helped. :)
The three observations that could help an individual in distinguising whether the organism is a fish or not is that it should live under water as fish can't survive without water, another thing is that it should laid eggs when it comes to giving birth because when it does not lay eggs but produces a living organism normally without an egg, it is considered to be a mammal and lastly, the appearance it possess such as having gils or fins.
