Mold fossils and cast fossils
Coming up with the theory of evolution
Many cacti have roots that spread out widely, but only penetrate a short distance into the soil. In one case, a young saguaro only 12 cm (4.7 in) tall had a root system with a diameter of 2 m (7 ft), but no more than 10 cm (4 in) deep.
In other words they can't penetrate that deep.
They both take place in the nucleus :)
The second generation was the one that was allowed to self pollinate
