Why do scientists use models to explain atomic structure?

What is required for a cell to be considers living

2. An adaptive advantage of having a three-chambered heart, as found in amphibians, over the two-chambered heart of fish is thatA. there are capillary beds in both the respiratory organ and body systems of amphibians but not fish. B.

Why is there controversy to the opinion that human contribution of carbon dioxide to the atmosphere is causing global warming? choose the answers that best fit Because the Earth goes through periodic cycles of cooling and warming.

How cold is it on pluto

Is Glycogen a long term energy carbohydrate?

10. Briefly explain the secondary structure of a protein.

Which statement regarding fermentation is false? a. Fermentation produces lactate in heavily exercising muscle. b. At least one form of fermentation requires an enzyme with a thiamine pyrophosphate coenzyme. c.

there are four trophic levels in a food chain: Algae, salmon, bears and humans. if algae produce 6500 kj of energy, calculate the amount of energy that is passed on to each trophic level

Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. After the system reaches equilibrium, what changes are observed?

How has human activity impacted the evolution of the peppered moth?