Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?
orgars
muscles
fluids
bones

bones

Explanation:

The x-rays go through the soft tissue of things like organs, muscles, skin, etc, but is reflected by denser, less penetrable bones.

Hope this helps!

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.