Pick all the right ones Hlep hurry

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.