What is the main problem associated with metal refining?

it is extremely dangerous.
it does not produce very much refined metal.
it generates a great deal of waste.
it uses up a great deal of energy.

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Cassandra made a venn diagram to compare and contrast the two stages of cellular respiration. which belongs in the area marked x? energy is released. oxygen is used up. glucose is broken down. carbon dioxide is used up.

Which statements about a food chain are true? choose all answers that are correct. a.plants are the first living organisms in food chains on land. b. the plants in a food chain are called herbivores. c. all food chains on land begin with energy from the sun. d. carnivores in a food chain eat only plants.