In one of her epeditions, a marine biologist finds a new organism that has an unsegmented, radially-symmetrical body with spiny skin. under witch phylum should she classify this organism annelids arthropods echinoderms mollusks

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird