Why are fossil fuels considered a nonrenewable resource while biomass are renewable?

What is the amount of organic matter in all living organisms in a habitat called?

When the soviets created the borders of their central asian and caucus republics, the paid little attention to where each region’s ethic group lived. ethnic-related disputes exist along every sherd boundary in central asia. true false

In the diagram, δgef and δhef are congruent. what is the value of x?