Which level of organization within the biosphere is made up of many different organisms that exist in the same environment as well as the nonliving things that they interact with?

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

In which state was more than 100 billion tons of coal mined in 2005?

What are the pros and cons of quadrat sampling?