Ecological diversity can be described as the variations which are present among different ecosystems and how these variations impact the life on Earth. The differences present in the aquatic and terrestrial ecosystems are defined by the ecological diversity.
As Henry is observing the differences in the aquatic life as well as the terrestrial life, hence he is studying ecological diversity.
Ecological diversity is a type of biodiversity i.e diversity of all the living components of ecosystems.
Likely if you harm the ribosomes the cell will die. Cells absolutely require ribosomes for normal functioning...they are constantly replacing proteins (including enzymes and the ribosomal proteins) to keep alive.