How are genes and nitrogen bases related?

What is the difference between how ionic and covalent bonds form

The table lists the observations students made about four specimens under a microscope. based on these observations, what specimens did the students examine? animal plant virus prokaryote cell membrane present ribosomes present lysosomes present nuclear membrane present cell wall present ribosomes present nuclear membrane absent cell wall present ribosomes present nucleus present large vacuole present reproduces inside of a cell nucleus absent rna present 2019 edmentum all rights reserved intl

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.