The following frequency distribution shows the distribution of delivery times (in days) for swimstuff.com customer orders during the last month. 
How many orders were delivered from 1 day up to 3 days?
Definitions:
Chlorophyll
A pigment found in plants and algae that absorbs sunlight for photosynthesis, giving them their green color.
Denitrification
The microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen, such as nitrogen gas, effectively removing nitrogen from ecosystems.
Gaseous Nitrogen
Nitrogen in its gaseous state, making up about 78% of the Earth's atmosphere and serving as a critical element for life.
Root Nodules
Swollen lumps on roots of certain leguminous plants containing symbiotic nitrogen-fixing bacteria, crucial for converting atmospheric nitrogen into a form plants can use.
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