Annelids are segmented worms. And they do not have mandibles.
The animals that are segmented are vertebrates, arthropods and annelids.
Sure you know that vertebrates have mandibles. But what about arthropods. Well, arthopods include insects, arachnids, myriapods and crustacens. You probably also know that insects and arachnids have mandibles. Myriapods (like the centipedes) and crustaceans also have mandibles. So the answer is annelide.
Angiosperms are the most diverse
and successful plant group. It has double fertilization which leads to the
formation of an endosperm. It also has a stamen with two pollen sacs. It has a
phloem tissue that is composed of sieve tubes and companion cells.
Answer:the decline of lichens is an important indicator of an imbalance in the ecosystem. this research can help system ecologists predict how pollution will affect the entire ecosystem
