What lead to the variation within a species or a population plz answer this question

What is a codon and where is it found

Which image shows labeled organelles that are present only in plant cells?

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