Pls help me on this question and noo linkss plz

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit

What type of plant is good for a bioassay and where can i buy it? i only have a month.

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.