A, as the seeds fall off in faraway lands.
The answer is global warming
A Respiration by animals CO2 is being added.
B trees burning same
C tree leaves removed
D oil added
The body wall<span> of a star fish is made up of a thin cuticle, an epidermis with a single layer of cells, a thick dermis composed of connective tissue and a thin coelomic myoepithelial layer, which allows the longitudinal and circular musculature.</span>
