Question

use this chart to calculate biomass eaten. transfer the last - column of your data chart to the second column below. then multiply that number times the third column - mass (g). then convert from g to kg. next, multiply the mass of prey (kg) with the annual food (kg)/kg of prey to get the biomass eaten in kg. add the two columns to get the two totals needed for part d.

prey	number eaten per year	mass (g)	mass of prey (g)	mass of prey (kg)	annual food (kg)/kg of prey	biomass eaten (kg)
vole	28	25		7 kg	10 kg
mole	55	5		1.5 kg	15 kg
shrew	750	5		2.5 kg	9 kg
bat	240	20		4 kg	4 kg
bird
total						total

Explanation:

Step1: Convert mass from g to kg

For Mouse: $45g=\frac{45}{1000}kg = 0.045kg$, for Vole: $28g=\frac{28}{1000}kg=0.028kg$, for Mole: $55g=\frac{55}{1000}kg = 0.055kg$, for Shrew: $240g=\frac{240}{1000}kg=0.24kg$, for Bat: $20g=\frac{20}{1000}kg = 0.02kg$.

Step2: Calculate biomass eaten for each prey

For Mouse: $200\times0.045\times10 = 90kg$.
For Vole: $28\times0.028\times7=5.488kg$.
For Mole: $15\times0.055\times15 = 12.375kg$.
For Shrew: $750\times0.24\times9=1620kg$.
For Bat: $4\times0.02\times4 = 0.32kg$.

Step3: Calculate total biomass eaten

$90 + 5.488+12.375 + 1620+0.32=1728.183kg$.

Step4: Calculate total number eaten per year and total mass of prey

Total number eaten per year: $200 + 28+15+750+4=997$.
Total mass of prey (in kg): $0.045+0.028 + 0.055+0.24+0.02=0.388kg$.

Answer:

The total biomass eaten is $1728.183kg$.