Question

global warming is an increase in the global annual temperature. true false which human activity contributes most to greenhouse gas emissions? fishing agriculture transportation burning of fossil fuels the main purpose of the heart is to clean waste from the blood before it goes to the lungs. mix blood from the lungs and the body. remove toxic substances from blood after it comes back from the lungs. pump blood through the body and blood through the lungs.

Explanation:

• Global warming is indeed an increase in the global annual temperature.
• Burning of fossil fuels releases large amounts of carbon dioxide (a major greenhouse gas). Fishing has minimal direct contribution to greenhouse gas emissions. Agriculture has some emissions (e.g., methane from livestock) but less than fossil - fuel burning. Transportation uses fossil fuels (so is related to fossil - fuel burning emissions but the direct activity of burning fossil fuels (e.g., in power plants) is a larger source).
• The heart's main function is to pump blood. It pumps oxygen - poor blood to the lungs (for oxygenation) and oxygen - rich blood to the rest of the body. The liver is mainly responsible for cleaning waste and toxic substances from the blood. There is no mixing of blood from the lungs and the body in the heart in a way that is its main purpose.

Answer:

1. True
2. burning of fossil fuels
3. pump blood through the body and blood through the lungs.