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Alex_Xolod [135]
3 years ago
12

Most cnidarians have two layers of cells that are organized into tissues that have specific functions.

Biology
1 answer:
erastova [34]3 years ago
3 0

Answer:

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:

  • <u>epidermis</u>, which is the external layer,
  • <u>gastrodermis</u> which is the internal layer, composed by lining cells in the gastrovascular cavity.

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

Epidermis and gastrodermis <em>originate from two embryonic tissues</em>, the ectoderm, and the endoderm.

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

<em>The gastrodermis</em> is composed of nutritive cells, glandular enzymatic cells, secretory cells, and sensorial cells.

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Before a captive breeding program and subsequent reintroduction of the black-footed ferret it is believed that their total popul
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Answer:

a) 99.93%

b) 99.98%

Explanation:

Given that:

Total population size was only around 18 individuals ( for  black-footed ferret)

If the annual survival rate in the wild was 0.4%.

a)

What is the probability that all 18 would have died in a single year?

To find that; we multiply the annual survival rate in the wild with the total population; which is:

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Then; we subtract it from a total of 100% in order to determine the probability that all 18 would have died in a single year.

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= 99.93%

b)

What is the probability that all 18 would have died in a single year if canine distemper was present?

Given that;

Because of the presence of canine distemper disease, the annual mortality rate might have been as high as 0.89.

To determine the probability; we have:

1 - Annual mortality rate = annual survival rate

1 - 0.89 = 0.11 %

Therefore, 0.11% of 18 individuals = (0.0011 × 18)

= 0.0198%

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7 0
3 years ago
The atmosphere is 80% nitrogen: why do you think plants and animals can't use nitrogen as it is found in the atmosphere?
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Answer: Atmospheric Nitrogen is unreactive

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