the answer is a it can be used as an energy source by organisms
D would be the correct answer
I'm assuming you meant and frailness not fertility, in which case it is the oldest old period
The hydrologic cycle is another name for the water cycle.
Plants<span> do not have skeletons, but their shape is defined by the part of the </span>cell<span> called the </span>cell<span> wall. The </span>cell<span> wall is featured only in </span>plant cells<span> and is made of cellulose. Chloroplast: Chloroplast is another big </span>difference between plant<span> and </span><span>human cells. </span>