Electricity can be generated by burning material such as wood, crops, or garbage, this is known as: A. Solar

B. geothermal

C. fossil fuels

D. Biomass

Wich level of organization includes all the other levels or organizations

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?

Some substances but not other can cross the (blank) membrane of a cell