What experience led an engineer to invent velcro

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.

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

Why is the indus river so important to the people of pakistan?