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There are 1000 grams in one kilogram. Therefore, 400 kilograms is equal to 400 x 1000 = 400000 grams.
it is 400 grams or one fourth of a kilogram
The main difference between 900 kilograms and 900000 kilograms is the magnitude of weight; 900 kilograms is much lighter than 900000 kilograms. In numerical terms, 900 kilograms is 0.9 metric tons, while 900000 kilograms is 900 metric tons.
Approximately 4 kilograms of human tissue would exist at the fourth trophic level, assuming an average energy transfer efficiency of 10% between trophic levels in a food chain.
1 gram = 10^-3 kilograms 400 grams x (1 kilogram/1000 grams) = .4 kilograms the grams cancel out and you are left with the answer above. you an also just move the decimal place left 3 places.