Help please if you can answer this first I'll give you the brainliest

What element breaks down into yttrium-90?

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present