One of Galileo’s contributions to science was creating the coordinate plane system.
developing the scientific method.
improving the telescope.
inventing the astrolabe.

Developing the scientific method.

Explanation:

The scientific method is a variety of techniques for investigating certain phenomena, to collect or correct information about the Earth, life on earth or space.   There is a set of logical rules that must be adhered to during this scientific investigation, for example that the result can be measured in some way and that the experiment can be repeated.  The scientific method was created by the Italian astronomer Galileo Galilei, who devised this system as the best way to arrive at testable hypotheses about a certain scientific question.

a

explanation:

the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

explanation: