77. are enzymes produced by a cell to start (initiate mitosis)?

Landfills are waste disposal sites. they are often man-made depressions in the ground covered with a lining designed to prevent any leakage of waste materials. however, landfills can leak through the base resulting in negative impacts on the surrounding environments. what negative impact to the environment is caused by organic and inorganic constituents that are dissolved by rainfall in the landfills?

Which of the rock examples below is most likely to be metamorphic

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates