are a proxy that can be used to recreate past variations in atmospheric carbon dioxide concentrations.

What are the 5 basic elements of a map?

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.

Plants can have a positive and negative effect on the rate of weathering