Which two elements share similar properties? *
Oxygen and Sulfur
Oxygen and Nitrogen
Oxygen and Helium
O Oxygen and Chlorine

d. organisms have cells with different shapes and functions.

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

sorry if this did not , have a great day!