A fossil bone has 25% of this new radioactive element remaining. If the half-life of this new element is 10,000 years, how old is the fossil bone?

Which of the following is not a potential result of a bottleneck event? a. an increase in potential mates b. a decrease in genetic diversity c. an increase in inbreeding d. an increased chance of extinction

How is a CAM plant suited to its environment?

A 20 kg box has been lifted 0.7m. How much work has been done?

In addition to water and carbon dioxide, photosynthesis requires A. Light and chlorophyll B. Oxygen and sugars C. Sugars and light D. Chlorophyll and oxygen

Which statement explains why the same side of the moon is visible from earth every night

The loss of the ability of the larynx to produce normal speech sounds is called:

Explain how a blood glucose concentration of 7.5 mmol dm-3 would be brought back to normal in the body of a mammal and why this is a negative feedback mechanism

What is the salinity of ocean water

Which of the following could describe a population that is decreasing in size

Which creature cannot survive in the presence of oxygen? Give Examples. What does the creature need to survive instead of oxygen?