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?

Is atmospheric nitrogen easily used by plants

Which statement best describes why food webs consist of many food chains put together? A. All animals are carnivores. B. All living things eventually die and decompose. C. Most organisms eat more than one thing. D.

Which level is most commonly meant by biodiversity

If a mother is type A and has a child who is type B what are the possible blood types of the father

Since ribosomes are found in bacterial cells, do ribosomes have a membrane around them? Why or why not?

What mineral is used as a coating for steel?

How do earthquakes at divergent plate boundaries differ from those at convergent plate boundaries? Earthquakes at divergent boundaries are deeper and more severe. Earthquakes at divergent boundaries are almost always larger.

Salvador would like to take a paternity test to determine if he is Pilar's father. He asks Pilar's mother, Antonia, to provide DNA samples for both her and Pilar. Which technique will most likely be used to compare the three DNA samples?

What is not a a form of passive transport

12. When a plant grows on the shade