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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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Answer:

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Explanation:

Hope this helps!

8 0
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Read 2 more answers
What is the function of restriction endonucleases in bacteria?
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Answer:

This is an incomplete question without the options.

Here are the options to pick from

DY

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Within a six-base DNA recognition sequence, an enzyme that cuts between the 3rd and 4th bases from the 5' end will generate blunt ends.

a)True

b)False

a) True

What is the function of restriction endonucleases in bacteria?

a) They serve no function.

b)They allow bacteria to genetically recombine with other bacteria.

c) They allow bacteria to engineer new DNA fragments.

d)They provide a defense mechanism against infection by viruses.

Our answer is surely D

d)They provide a defense mechanism against infection by viruses.

Explanation:

Restriction enzyme/restriction endonuclease:

Are produced by bacteria for cleaveing DNA at specific sites. Restriction enzymes cleave foreign DNA in the bacterial cell to fight against infecting organisms.

Pls Note:

Restriction enzyme are used by

bacteria to defend against bacterial viruses called bacteriophages or phages

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