What is the common name of the group whose members are characterized by endoskeleton and a unique water vascular system?

a. tunicates
b. medusas
c. echinodermes
d. brachiopods

plz

Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3

Classify the structures as homologous or analogous, depending on their structure and function.

What is the ecological role of food chains and food webs