T or f Microscopes use curved pieces of glass to bend light

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

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

The biosphere of the earth is made up of what compound? organic or inorganic?