When a species no longer exist it is said to be

Suggest reasons for using synthetic forms of drugs rather than using plant extracts directly

Atmospheric carbon dioxide produces a so-called "greenhouse effect" by trapping heat near Earth's surface. What human activities might tend to increase the greenhouse effect?

Diet and exercise are both considered factors in cancer risk. Exercise is good for just about everything, but what should you eat? A. A healthy mix of red meat and fruits and vegetables B. Foods that are white C. Red meat and foods with high fiber D.

Which statement describes electromagnetic waves with wavelengths greater than 700 nanometers? O They take the form of heat. They can cause skin cancer and sunburn. They are some of the shortest waves.

Which organisms fix nitrogen in the soil Omnivore Bacteria Plants Nodules

Which human activity has had the greatest impact on climate change? A. deforestation B. burning fossil fuels C. production of nuclear waste D. building skyscrapers

How long can food that requires time-temperature control be left in the danger zone? A. A maximum of 3 hours B. A maximum of 4 hours C. A maximum of 1 hour D. A maximum of 2 hours

Explain the characteristics of this soil sample that likely allowed Judy to make this identification. Include particle size and texture in your response.

Rick uses an electronic air sampler to determine the amount of dangerous chemicals in the air. Which functions of the air sampler confirm that it is an electronic tool? Check all that apply. It collects chemical data.

Prokaryotic cell lacks membrane - enclosed structure is called?