What is the name of the process by which the sun’s energy reaches the earth?
photosynthesis
radiation
convection current
chlorophyll
In which direction does hot air flow?
downward
westward
upward
eastward
What happens to hydrogen during photosynthesis?
It disappears into the atmosphere.
It bonds with nitrogen.
It is absorbed by the sun.
The plant uses it to create food
When matter is in living form, it is called
biomass
a food web
solar energy.
energy flow.
Which of the following happens to bears during hibernation?
bears consume more food
bears expend energy by catching salmon
bears have a lower body temperature
bears have a faster heartrate
