Why is it important that scientific experiments be
repeated?

It is important that scientific experiments be  repeated to ensure that the data gathered from the experiment is reliable.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

the tricuspid valve is present between right atrium and right ventricle