An exceptionally rainy spring caused many mud slides that covered most of the grass plants and their seeds in soil too deep for successful sprouting. A few seeds were covered in less soil and were able to sprout and reproduce A. Gene Flow
B. Genetic Drift

what image you forgot to include it.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

there really is life in the deepest part

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.