Question

echinus and holothuria are placed in phylum?

1.porifera
2.mollusca
3.echinodermata
4.annelida

explain your answer.

Answer 1

Hey mate
ur answer for this is echinodermata
as the main reason for these two species placed in echinoderms is that they r exclusively Marine......
n they r racially symmetrical
shows tube within tube body plan these all r characteristics of phylum echinoderms..... therefore they r kept in this phylum....

Answer 2

Answer:

3. echinodermata

sexual and gonochoristic

Explanation:

for example: Asteria, Echinus, Antedon, Holothuria.