The star 61 Cygni, in the constellation Cygnus, is a little more than 11 light-years from Earth. Which of the following correctly estimates the time it would take to reach 61 Cygni, based on speed of travel? (A)22 years traveling at twice the speed of light
(B)11 years traveling at the speed of light
(C)5.5 years traveling at half the speed of light
(D)1.1 years traveling at one-tenth the speed of light.
Please help

Four major subsystems called "spheres." --the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air). 
biota- the total collection of organisms of a geographic region or a time period, from local geographic scales and instantaneous temporal scales all the way up to whole-planet and whole-timescale spatiotemporal scales. The biota of the Earth lives in the biosphere. 
photosynthesis- the process of converting light energy to chemical energy and storing it in the bonds of sugar. occurs in plants and some algae (Kingdom Protista). Need only light energy, CO2, and H2O to make sugar. 
I'm betting on D. photosynthesis, which links biological organisms to the air, land, and water.