What does an energy pyramid represent? by a food web and energy pyramids

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above

This is a scaffolding of protein fibers that us sell keep it shape in a cell division and cell movement