biology. i need some help!!!! *tear*?

[need homework help!]

7-which phylum evolved first?
A) annelids
B) bivalves
C) nematodes
D) planaria

10-When a spider bites, it uses its ____.
A) chelicerae
B) mandibles
C) pedipalps
D) silk glands

13-During feeding, planarians extend a tubelike, muscular organ called the _____________ out of their mouths.

14-A(n) ___________________ is the tube-shaped body form with a mouth surrounded by tentacles, which serves as the asexual stage in some cnidarians

15-In _____________________, eggs remain inside the animal’s body and sperm are carried to the eggs