Which of the following best explains the importance of earth’s crust to living organisms?
a.
the continental crust allowed the evolution of life on land.
b.
the crust provides raw materials necessary for life.
c.
the crust allowed the formation of fossil fuels.
d.
the rock cycle recycles sedimentary rocks formed from animal shells.

What are the steps of how energy is transformed in plant cells?

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?