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pentagon [3]
3 years ago
15

Do all substances have melting points ? why or why not ? give two examples from the text

Biology
1 answer:
Pachacha [2.7K]3 years ago
4 0

Explanation:

The melting point is the temperature at which solid substance turns to a liquid phase. However, not all substances observe this change in phase. Some sublimate- which is the turning from solid to gas without transiting the liquid phase. Such substances are; dry ice (solid CO2), arsenic, naphthalene, and iodine.

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Which group makes up the greatest amount of marine life mammals,fish,plankton,shellfish
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Plankton they are the base for marine life
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2 years ago
You are going on a trip to the moon. Think about three things you would take with you and tell why you would take these three th
Flauer [41]

HELP ME

PERIOD, FREQUENCY OR AMPLITUDE

1. Doesn't change period

2. More of this means more energy

3. Increases as a pendulum swings back and forth faster

4. Measured in cycles per second

5. Measured in meters or centimeters

6. This is decreases with smaller swing

7. If the frequency increases, this decreases

8. Measured in Hertz

9. Measured in seconds

10. if it swings back and forth slower, this decrease

11. As it dampens, this decreases

6 0
2 years ago
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In the F2 generation of a dihybrid cross two phenotypes appear in the ratio 1:1. two phenotypes appear in the ratio 3:1. four ph
Bezzdna [24]

Answer:

four phenotypes appear in the ratio 9:3:3:1

Explanation:

<em>For a dihybrid cross in which the two genes concerned obey simple dominant/recessive law and are independently assorting, </em><em>four phenotypes are produced in the ratio 9:3:3:1. </em>

The dominant gene takes up the largest ratio (9/16) while the recessive gene takes up the smallest (1/16). Any deviation from 9:3:3:1 and the number of phenotypes produced from a dihybrid cross is an indication that the genes involved do not obey Mendelian laws.

8 0
2 years ago
An example of natural selection is the tail of a male peacock. The females of the species choose mates based on the colors of th
Sati [7]
<span>(decreased variation in tail feather color because no form of the trait is advantageous) Due to the fact that the tail color is no longer a necessity, so it will eventually stop being needed and variation will decrease.</span>
6 0
3 years ago
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What is the function of restriction endonucleases in bacteria?
Scilla [17]

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

3 0
3 years ago
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