Suggest why red onion is often used when carrying out this investigation

the cells in the onions are already dyed also it has a contrastarctary character hope this helps

Explanation:

the growth of the plants is affected by the heat of the light. what is the student doing?

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.