<h3><u>Answer;</u></h3>
<em>2 atoms of nitrogen </em>
<h3><u>Explanation;</u></h3>
- A compound is a substance that is made up of different types of atoms from different elements. For example water is a compound made up of hydrogen and oxygen atoms.
- In this case; Ni(NO₃)₂, is an example of a compound. It is <u><em>made up of 1 nickel atom, 2 atoms of nitrogen, and six atoms of oxygen</em></u>.
<span>Pond organism is unicellular and crab is multi cellular.
The simplest level at which life exist is called the cell. Unicellular organism contain only one cell while multi cellular organisms contain more than one cell. Multi cellular organisms can be organized into various levels such as Cells>tissues> organs>organ systems> organism. Thus pond organism is unicellular under microscope and crab is multi cellular.</span>
