Choose the definition of: invertebrates
a. having no backbone
b. have a backbone
c. having several backbones
d. having lost a backbone

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?