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

Texas has an impending storm, and california is experiencing a water crisis. match the technologies with the state that can use them to reduce the effects eddies natural hazards. texas is the storm cellar and the wood that is crisscrossed. california is the dam and the storage tanks

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated