An 80-kg hiker climbs to the top of a tall hill and builds up 470,000 j of gravitational potential energy. How high did the hiker climb? round the answer to the nearest hundred.

The graph shows a trend in an ecosystem over time caused by increased pollution in the region. what can you conclude from the graph? a. there’s lower biodiversity among birds. b. there’s a higher reproductive rate among birds. c. there’s a significant decline in the number of producers. d. other types of animals were unaffected by pollution.

Match each fossil with the layer where it’ll be present based on those conditions.

How do we determine if they are made with matter