Which of the following has a vase-shaped body structure? a. a medusa b. a polyp c. a sponge larva d. a shark

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.

What factors contribute to the effect an environmental toxin has on the human body?