To support the ecosystem in the previous question, botanical gardens are propagating these trees for sale. Although seeds have been collected, the commercially available plants are from cuttings and tissue culture. Based on the life cycle of conifers, why is it not practical to reproduce Wollemi pines from seed or even to sell the seeds?

A tree that possesses scale or needle-like leaves and cones that remains green throughout the year is known as a conifer. Some of the examples of conifers are cedars, junipers, redwoods, pines, etc. These trees have great economic importance as they are the prime sources of turpentine and resins, and are also a great source of softwood.  

It is not practical to cultivate the Wollemi pines from their seeds, as the majority of the seeds that fall from the cones of Wollemi are not viable, and their cultivation may even consume many months. The species mentioned is also considered as endangered, therefore, it will not be feasible to cultivate them via the help of seeds.  

the answer to your question is slate

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.