C.) Cone
A cone (in formal botanical usage: strobilus, plural strobili) is an organ on plants in the division Pinophyta (conifers) that contains the reproductive structures. The familiar woody cone is the female cone, which produces seeds. ... The individual plates of a cone are known as scales
D) . To be a source of energy
The rabbit is the source of energy to the fox.
A public good.
The above question includes the definition of what is called a public good in economics.
Tough outer coating; organelles are responsible for functions inside a cell.