If 20.0 grams of silver nitrate are dissolved in water and the resulting solution is divided into two equal portions and poured into two beakers, how many moles of aluminum and how many moles of zinc are required to replace all of the silver in the separate reactions

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.