Which two structures perform similar functions in cnidarians and sponges?

spicules in cnidarians and pores in sponges
tentacles in cnidarians and nerve cells in sponges
stinging cells in cnidarians and cilia in sponges
gut in cnidarians and collar cells in sponges

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..

What causes temperature extremes in the desert

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry