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Aneli [31]
3 years ago
12

When the source of a wave is moving relative to an observer of the wave, which of the following is true?

Biology
1 answer:
galina1969 [7]3 years ago
4 0

Answer:

Observers ahead of the wave observe an apparent increase in wave frequency  

Explanation:

This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.

B, C, and D are wrong. Observers behind the source notice a decrease in frequency.

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Answer:

Sample 4.

Explanation:

Oxygen is very important for life, so this should be present.

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3 years ago
I need a list of unicellular organisms.<br> can someone please help????
SSSSS [86.1K]

Answer:

Bacteria.

Archaea.

Protozoa.

Unicellular algae.

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Explanation:

4 0
2 years ago
If a cell has made extra copies of itself but then they divide in half , the first copy gets DNA but the second doesn't. What el
posledela
Mitosis is the process of cell division that creates a new cell identical to the original. Somatic cells, such as muscles, hair and skin, undergo mitosis regularly in humans and other organisms. This is an important type of cell division needed to facilitate the repair of damaged cells, growth and replacement of old cells with new ones.
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6 0
3 years ago
Sea urchins tend to have great camouflage because they sometimes carry what two animals on there shells?​
Fudgin [204]

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<h3>What is camouflage?</h3>

Camouflage is a defense mechanism used by certain organisms to avoid predation or surprisingly attack their prey.

Different animals possess different camouflage mechanisms. For example;

  • Chameleons change their color to that of their immediate environment
  • Certain snakes hide in vegetations that blend with their skin color.

However, sea urchins are aquatic animals that tend to have great camouflage because they sometimes carry algae and rocks on their shells.

Learn more about camouflage at: brainly.com/question/10913375

5 0
2 years ago
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marta [7]

Plant cells have plastids and larger vacoule and they also have tough cellulosic cell wall outer to cell membrane as a covering.

Animal cells don't have cell wall rather they have cell membrane as it's outermost covering and they have smaller vacuoles.They also don't have plastids.They have centrosome which is not found in plant cells.

6 0
2 years ago
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