Acentered biaxial optic axis figure has a curved isogyre extending from the northwest to southeast quadrants and is convex towards the northeast quadrant. on inserting a first order red interference filter, the region to the northeast of the isogyre turns yellow and to the southwest of the isogyre turns blue. what is the optic sign of the mineral?

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.