Most cnidarians have two layers of cells that are organized into tissues that have specific functions.
a. true
b. false

The answer is TRUE. Most cnidarians have two layers of cells that are organized into tissues: Epidermis and Gastrodermis.

Explanation:

Cnidarians' basic body organization is simple: It is a hollow structure composed of two cellular layers:

Between these two there is the mesoglea that varies from a thin, non-cellular membrane to a mucous, fibrous, thick membrane with amebocytes.

Epidermis and gastrodermis originate from two embryonic tissues, the ectoderm, and the endoderm.

The epidermis is formed of five types of cells with different functions: epitheliomuscular, interstitial, cnidoblasts, secretors, and sensorial.

The gastrodermis is composed of nutritive cells, glandular enzymatic cells, secretory cells, and sensorial cells.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.