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barxatty [35]
3 years ago
8

How do fish make it through winter in lakes that tend to freeze over?

Biology
2 answers:
asambeis [7]3 years ago
8 0

In the warm months of the year, it is natural to find cooler water at the depths of a lake; the exact opposite is true in winter. Due to the way that molecules arrange themselves in the water, warmer water stays at the bottom of the lake and cooler water stays at the top. Fish tend to swim to the warmer areas when lakes freeze over, and some even go to the very bottom and burrow into the mud there for added warmth.

As winter wears on, levels of oxygen in the water, leaving fish in a vulnerable state. When oxygen is low, fish may reduce their activity level and shut down feeding until conditions are more optimal. Persistent levels of low oxygen can result in freeze out, which is also known as winterkill, causing fish to die off due to lack of oxygen in the water. This is a natural phenomenon that is seen in harsher winters or winters that are particularly long and extreme.

ohaa [14]3 years ago
4 0
They stay in deeper warmer water and move allot and eat a lot of bait food
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Compare the shapes of the organisms that have cell walls with those that do not have cell walls.
inna [77]
The best answer is A. The purpose of the cell wall is to hold the cell in a specific shape, usually rectangular or square. For example, a plant cell's wall keeps it rigid so that the plant can stand up. 

If the cell does not have a wall, it can easily change shape to accommodate for things coming in and out of the cell. 

Hope this helps!
5 0
3 years ago
Which nucleic acid is pictured on the right? Justify your answer.
alukav5142 [94]

Answer:

Nucleic Acids:

- Uracil

- Adenine

- Guanine

- Cytosine

Explanation:

Since we only have one strand shown, I'm going to assume it is RNA. Both DNA and RNA have nucleic acids, but RNA has 1 different nucleic acid; it replaces Thymine with Uracil. So the 4 nucleic acids are uracil, adenine, guanine, and cytosine.

If the picture shown is a cross-section of DNA, then our 4 nucleic acids are adenine, thymine, guanine, and cytosine.

6 0
3 years ago
Read 2 more answers
What kind of consumer is a penguin? secondary or tertiary?
Dafna11 [192]

Answer:

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7 0
2 years ago
Read 2 more answers
An owl has good night vision because its eyes can detect a light intensity as small as 5.0 × 10-13 W/m2. What is the minimum num
Lady bird [3.3K]

Answer:

Thus, the minimum number of photons per second is 77.34

Explanation:

Light intensity, I_{min} =  5\times 10^{-13} W/m^{2}

Pupil has a diameter, d = 8.5 mm

                                      = 8.5 x 10^{-3} m

Radius of the eye, r = 4.25 x 10^{-3} m

∴ Area of the eye, A = \pi .r^{2}

                                 = 3.14\times \left ( 4.25\times 10^{-3} \right )^{2}

                                = 5.6\times 10^{-5} m^{2}

Let P_{min} be the minimum number of photons.

Therefore, P_{min} = I_{min} x A

                                              = 5\times 10^{-13} x 5.6\times 10^{-5}

                                             = 2.8\times 10^{-17} W

Thus the minimum number of photons is given by

N_{min}=P_{min}/E

where E = hc/\lambda

             = \left (6.63\times 10^{-34}\times 3\times 10^{8}  \right )/548\times 10^{-9}

            = 3.62\times 10^{-19} J

Therefore, N_{min} = \frac{2.8\times 10^{-17}}{3.62\times 10^{-19}}

                                              = 77.34 photons per second

Thus, the minimum number of photons per second is 77.34

4 0
3 years ago
What is the 2nd phase of cellular respiration? what happens?
liubo4ka [24]

The second phage of cellular respiration is transition stage.

Process take place in transition stage:

The transition stage take place in mitochondria. The pyruvate is combined with NAD+ to form NADH and acetyl co-enzyme molecules.

After transition stage, Krebs cycle starts.

5 0
3 years ago
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