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julia-pushkina [17]
3 years ago
5

A muscle cell contracts or expands when

Biology
1 answer:
yanalaym [24]3 years ago
3 0

Answer:

Walking

Explanation:

A muscle cell usually contracts or expands simultaneously when one is working or doing some activities like running, exercises, house chores e.t.c

Muscles are flexible fibers that are very essential appendages for locomotion in human beings.

For muscle cells to contract, they are pulled together thereby causing tension in the muscle. When they are relaxed, they move away from one another.

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C. Mutualistic relationship

Flowers and hummingbirds have a mutualistic relationship where both benefit. Flowers produce food in the form of nectar (sugar and water) to attract hummingbirds which, in turn, move pollen for the plant (pollination).
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3 years ago
Which features do sound waves have that ocean and light waves do not? Check all that apply.
Shkiper50 [21]
<h3><u>Answer;</u></h3>

Compressions

Rarefactions

<h3><u>Explanations;</u></h3>
  • A wave is a transmission of a disturbance from one point to another, and involve the transfer of energy from the source to another point.
  • Waves may be classified as longitudinal waves or transverse wave depending on the vibration of particles relative to the wave motion or mechanical and electromagnetic waves based on the material medium of transmission.
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3 years ago
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Archaeologists unearthed a human skull with a small dried fragment of the scalp still attached. They extracted a tiny amount of
fomenos

Answer:

D. Use the polymerase chain reaction

Explanation:

Polymerase chain reaction (PCR) is a molecular technique used to make multiple copies or amplify  a particular DNA sample. This enables scientist conduct thorough genetic analysis on minute sample of DNA, simply by amplifying it to a large quantity.

The PCR machine is usually used to amplify DNA fragment. The DNA fragments undergo three major steps successively: denaturation, annealing and elongation

8 0
3 years ago
40 POINTS! NEED ANSWER QUICK!
eduard
If i was u i would look it up thats what i would do

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The steps in the scientific process in order are hypothesis, observation, experimentation, conclusion.
7nadin3 [17]

Observation should come first. Check the other answers in case im mixing up a different method. False.

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