The continents began to drift apart by the end of the period. a. cretaceous b. neogene c. cambrian d. permian

The pronunciation aid that determines the stress placed upon a syllable is the

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent  

Which could be a pathway of food through an ecosystem