Which of the following characteristics would most likely be attributed to a hydra? Check all that apply.
(A) brain tissue
(C) bilateral symmetry
(D) gastrovascular cavity
(B) and (D) are both correct. Hydra do not have a complex nervous system; they are diploblastic have two germ layers instead of three; are radially symmetrical symmetrical on multiple planes; and have, indeed, one cavity called a gastrovascular cavity through which substances flow in and out.