ODIS Observation: I want to know what effect alt has on the growth of grass. sot measure out a equal sized squares of
crass
out the back of the Green Building The first square of lawn water with 5 litres of pure water from a watering
can every day. The second square of tawn I water with S litres of pure water with 2 grams of salt mixed in every
day. The third square of lawn t water with slitres of pure water with 4 grams of salt mixed in, every day I measure
the height of the erass after 14 days and note the following observations. The first square is green and 15 con high
The second sauere is creeny yellow and 6 em high. The third square is yelowy brown and looks dead and only 2cm
high.
"

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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