Which is characteristic of reliable experimental results?

Two things that biomedical has invented or innovated

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?