Early organisms in the Precambrian era converted to oxygen. O A. water vapor
O B. nitrogen
O c. carbon dioxide
D. sulfur dioxide

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

Apuppy’s tendency to chew is inherited through which of the following? a. through learned behavior b.through genes c. through seasonal cycles d. through hibernation

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer