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Illusion [34]
3 years ago
5

Some birds, like the Ptarmigan, change the color of their feathers at different times of the year. In the summer months, the Pta

rmigan has brown feathers. In the winter months, the Ptarmigan has white feathers. This color change allows the Ptarmigan to blend into its surroundings, no matter the season. What causes this color change to occur?
Biology
1 answer:
Ierofanga [76]3 years ago
7 0

Answer:

They change their color so they wouln't be spotted by predators. Its like a self defence meckanisum ( i dont knwo how to spell) so they wouldn't get caught.

Explanation:

hope this helped

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Peripheral resistance depends on all of the following factors except __________.
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Options for the question have not been given. They are as follows:

blood vessel length

blood viscosity

blood vessel diameter

blood colloid osmotic pressure

Answer:

blood colloid osmotic pressure

Explanation:

  • Peripheral resistance is the resistance to blood flow by blood vessels.
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  • It is also directly proportional to blood viscosity as more energy is required to push viscous material.
  • It is indirectly proportional to blood vessel diameter. More the diameter of the vessel, easier it is for the blood to pass.
  • However, it does not depend on blood colloid osmotic pressure. Colloid osmotic pressure is created by the protein components of blood and they do not have any direct impact on blood flow.
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4 years ago
Both rock and bodies of water are considered a type of
pantera1 [17]

Answer:

Reservoirs

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8 0
3 years ago
What must businesses do in order for the economy to be strong?
NNADVOKAT [17]
"Produce goods and pay workers" is the one thing among the choices given in the question that businesses must <span>do in order for the economy to be strong. The correct option among all the options that are given in the question is the first option or option "A". I hope the answer has come to your help.</span>
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During primary succession it is the competition of resources that leads to changes/replacement of species in area over time
VMariaS [17]

Answer: False

Explanation:

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This is not driven by competition for resources because only certain organisms can even survive in the area in the first place such as lichens or plants which then convert the area to a more habitable form for other organisms over a period of centuries.

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3 years ago
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