Wich of the following about language is true?

Which of the following statements is true? a. there is not enough food produced in the world to feed everyone. b. the biggest cause of hunger and malnutrition is the cost of getting food to people who need it most. c. most countries have enough arable land and resources to feed their own population and export a surplus d. malnourishment is only seen in a few countries with very limited food supplies.

What is the mercury length of time for one revolution around the sun?

What first caused people to consider that the continents were once one large landmass?