Http://www.livescience.com/22537-skeletal-system.html
Answer:
All living organisms show movement of one kind or another. All living organisms have internal movement, which means that they have the ability of moving substances from one part of their body to another.
D is probably right cos you are comparing data
It is called hydrosphere
It is the total water in Earth.
Viruses belonging to (+) ssRNA Tymoviridae and Tenuivirus are able to infect invertebrates and plants [15]. There are some virus families that have diverse host ranges. The Reoviridae (dsRNA) family includes viruses that infect vertebrates, vertebrates and invertebrates, or plants and invertebrates.