Identify the type of chemical reaction. nh3 + h2onh4oh decomposition exchange reversible synthesis

In sexual reproducing animals once fertilization of the egg takes place, the exists as a single cell until cell division begins. a) egg b) larva c) sperm d) zygote

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring