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Kobotan [32]
3 years ago
14

A bird flies by moving its wings up and down. Which two systems are most directly responsible for the movement of a bird's wings

?
A.
skeletal and muscular systems
B.
respiratory and muscular systems
C.
skeletal and digestive systems
D.
respiratory and digestive systems
Biology
2 answers:
aleksklad [387]3 years ago
4 0
A. Skeletal and muscular
the other three don’t have to do with this type of internal movement though as the abdominal region and internal organs don’t have to do with this, A is the only possible answer
dsp733 years ago
3 0

Answer:

The answer is A.  skeletal and muscular systems

Explanation:

the skeletal muscle systems is responsible for  the movements of many of the vertebrate living beings. The skeleton of the birds is highly adapted for the flight. It is extremely light in weight but strong enough to withstand the stress of takeoff, flight and landing. The largest muscles in the bird are the pectorals, which control the wing; these provide the powerful blow of wings, essential for the flight.

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1. How many food chains make up the food web?
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A food web can be formed by more than one food chain, since the webs includes all possible interactions that can occur between individuals of different trophic levels.

Explanation:

Based on the scheme shown in the image

<h3>1. How many food chains make up the food web? </h3>

This food network is made up of three food chains

  1. <em>Plant → Bird → Snake</em>
  2. <em>Plant → Insect  → Bird → Snake</em>
  3. <em>Plant → insect → Frog → Snake</em>

Food webs often include several food chains, since they are due to the interaction between organisms at different trophic levels, which actually happens within an ecosystem.

<h3> 2. Which organism is an herbivore? </h3>

In this case, both the insect and the bird are herbivorous organisms, since they feed of the producer, which is the plant.

<h3> 3. Which organism is an autotroph? </h3>

The only autotrophic organism is the plant, since it is capable of manufacturing its nutrients from sunlight and inorganic matter.

<h3> 4. Which organism is a third-order heterotroph? To what trophic level does that organism belong? </h3>

The third order heterotroph is the snake, since it feeds on other animals.  The snake is a carnivore and can be a secondary or more commonly tertiary consumer, so it can be placed in the 3rd or 4th trophic level.

<h3> 5. Which organism is an omnivore? </h3>

According to the scheme proposed, the bird is omnivorous, since it feeds on both plants and insects.

<h3> 6. Which organisms belong to more than one food chain? </h3>

In this case, the plant, the insect, the bird and the snake are part of more than one food chain.

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  3. <u><em>Plant → insect</em></u><em> → Frog → </em><u><em>Snake</em></u>
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The bird can be located in both the second and third trophic level, being a primary consumer —when it feeds on plants— or secondary, when it feeds on insects.

<h3> 8. What are decomposers? From which trophic levels are the organisms that decomposers feed on? </h3>

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