Lean body mass <span>is the body mass attributed to non-fat body components, such as bone, muscle, and internal organs. In general, lean body mass is the mass of the body excluding the fat. It is important in fitness regimes. Most body builders want to maintain their lean body mass and decrease their body fat. </span>
Plant and animal cells are very similar because they are both eukaryotic cells.
A physical change is basically a body change so like if a crayon is solid then sits in the sun for a long time it melts away that’s a physical change because it changes its physical appearance
In ecology<span>, a </span>niche<span> (</span>CanE<span>, </span><span><span>UK:</span> <span>/<span>ˈniːʃ</span>/</span></span><span> or </span><span><span>US:</span> <span>/<span>ˈnɪtʃ</span>/</span></span>)[1] is the fit of a species living under specific environmental conditions.
<span>https://en.wikipedia.org/wiki/Ecological_niche</span>
