You type the equal (=) sign into a cell to start a formula.
for example, =SUM(B1:B5)
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The Western Siberian Plain is marshy in some places because it has poor natural draining systems.
<h3>What is a Drainage system?</h3>
A Drainage system may be defined as the complete process to exhaust the water in the soil to improve crop production in an area. It eliminates the water through the surface of the earth.
The complete question is as follows:
The Western Siberian Plain is __________ in some places because it has poor natural draining systems.
- subtropical
- humid
- marshy
- arid
Therefore, the correct option for this question is C, i.e. marshy.
To learn more about the Drainage system, refer to the link:
brainly.com/question/908462
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He wrote his first software program. That should be the answer. He was around the age 13, and the rest of what happened is history.