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3 years ago

Do fish have an open or closed circulatory system? What does this mean?

Biology

1 answer:

dedylja [7]3 years ago

7 0

Answer:

They have a closed circulatory system.

Explanation:

In an open circulatory system, blood vessels transport all fluids into a cavity. When the animal moves, the blood inside the cavity moves freely around the body in all directions.

Closed circulatory systems are different to open circulatory systems because blood never leaves the blood vessels. Instead, it is transferred from one blood vessel to another continuously without entering a cavity.

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Both flat worms in round worms have a body type called?

olga2289 [7]

should be called Bilateral symmetry

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3 years ago

North Carolina ranks second in production of Christmas trees in the United States. Scientists in North Carolina use living cells

Snowcat [4.5K]

B, because it's not an advantage for something to be expensive and time consuming

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3 years ago

Read 2 more answers

You are an almond grower and want to determine whether almond size (measured as shelled almond weight) is a heritable trait. A s

inn [45]

Answer: 1. S = 0.77

2. R = 0.14

Explanation:

1. Selection differential is the difference between the population mean and the average of the selected parents. Its symbol is S.

S = mean of selected parents - population mean

S = 6.48 - 5.71

S = 0.77

2. Response to Selection is how much gain you make when crossing over selected parents. Its symbol is R.

R = mean of offspring of selected parents - population mean

R = 5.85 - 5.71

R = 0.14

3. Heritability is, basically, a statistical variable that shows how much the variation in a trait is due to genetic factors. Its symbol is h².

To calculate it, use Breeder's Equation:

R = h²S

$h^{2}=\frac{R}{S}$

$h^{2}=\frac{0.14}{0.77}$

h² = 0.18

4. You would expect the production to be strongly influenced by environment, because heritability lies between 0 and 1. Low heritability means there is low level of resemblance between offspring and parents. As this program heritability is low, the resemblance is small, which means the characteristics are influenced mostly by the enviroment.

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3 years ago

What type of signal is fast and requires daylight with no obstructions?

Artist 52 [7]

This would be called--Visual.

Hope this helps please hit the thank you button.

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3 years ago

A man with type A blood marries a woman with type

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3 years ago

Do fish have an open or closed circulatory system? What does this mean?​

Do fish have an open or closed circulatory system? What does this mean?