Each step in a food chain that demonstrates the transfer of energy is called a .

Works together in the synthesis, modification, packaging, and transport of lipids and proteins

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system

Hector is back from his morning run and is feeling light-headed because his energy is depleted which food item will provide him with a quick source of carbohydrates