An experiment was conducted in a closed system for five days. The percent of oxygen and carbon dioxide was measured daily and recorded in the table. What process most likely occurred that would explain the results?

An easy way to calculate the amount of energy available at each level is to what?

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.

The variation among individuals, on which natural selection acts