Tommy's experiment was to prove flea treatments bought a the vet's office 1 point repelled more fleas than the spray bought at Wal-Mart. Group A got the
Flea Rx from vet, Group B got the flea spray from Wal-Mart and Group C
did not receive any treatment. Group A average number of fleas per dog
was 1, Group B 10 fleas, and Group C 35 fleas. This type of data can be
describe as

b

is correct hope this   also i learnd this in middle school

carbon atoms, hydrogen, oxygen, and nitrogen.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.