What is one characteristic that you could observe to distinguish diatoms and dinoflagellates

Diatoms have a cell wall that includes silica, while dinoflagellates have a cell wall that includes cellulose.

Explanation:

Diatoms are unicellular algae. Some of them can live in colonies forming filaments or ribbons, they are surrounded by a cell wall made of silica called a frustula.

They are microscopic animals, almost always single-celled. They have flagella. They can be divided into two large groups differentiated by the presence or absence of cellulosic plaques in the cell wall or amphysm.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this

they kick it to the curb.

explanation:

that current was nasty.