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Ivahew [28]
3 years ago
15

What is the common name of the group whose members are characterized by endoskeleton and a unique water vascular system?

Biology
1 answer:
Llana [10]3 years ago
5 0
A. Echinoderms

Hope this helps!
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How does water temperature affect the rate of erosion?
astraxan [27]
The higher the water temperature, the higher the rate of erosion that it will cost.
When the temperature is high, the water will corrode the soil walls around it much faster when the temperature is low. This will make the soil wall become thinner in a faster rate and make the rate of erosion become higher.
4 0
2 years ago
n 1928, Fred Griffith performed an experiment revealing that genetic material can be passed _____. This experimental system was
nekit [7.7K]

Answer:

In 1928, Fred Griffith performed an experiment revealing that genetic material can be passed between two different stains of the bacteria.

Explanation:

In 1928, Frederick Griffith, a British bacteriologist conducted some experiments to develop a pneumonia vaccine. He used mice and two strains of Streptococcus pneumoniae bacteria, known as R and S in his experiments.

The live R strain bacteria had a rough appearance and were nonvirulent. When he injected R bacteria into mice, they did not cause pneumonia. The live S strain bacteria had a smooth appearance due to their polysaccharide coating and were virulent. When injected into mice, the mice died as a result of pneumonia. The polysaccharide coating protected the S bacteria from the immune system of the mice.

Griffith then injected mice with heat-killed S bacteria (the heat killed the bacterial cells) and they did not cause pneumonia in mice. But when he injected a combination of non-lethal R bacteria and non-lethal heat-killed S bacteria into mice, the mice died from pneumonia. When he examined the blood sample from the dead mice, he found that the blood sample contained live S bacteria. This finding leads him to the conclusion that the nonvirulent R-strain bacteria had been "transformed" into virulent and lethal S-strain bacteria by taking up a "transforming principle" from the heat-killed S bacteria.

This experiment was then used for additional experiments conducted by Avery, McCarty, McLeod and then by Hershey and Chase. They found the evidence that the transforming principle from Griffith's experiment was actually the hereditary material, DNA. The DNA of the S strain bacteria had survived the heating process. This DNA that contains the genes for the production of the protective polysaccharide coating was taken up by the R strain bacteria. The transformed R strain bacteria were now protected from their host's immune system and this process of transferring genetic information between different bacterial strains is known as transformation.

8 0
3 years ago
According to the principle of _______, hydrogen bonds can form only between adenine and thymine, and between guanine and cytosin
max2010maxim [7]

Answer: base pairing

Explanation:

4 0
3 years ago
Read 2 more answers
Which of the following is an example of diffraction?
makkiz [27]

<u>Answer:</u>

You try to pick up a shell in the water but it isn't where it appears to be is an example of diffraction

<u>Explanation:</u>

Diffraction refers to the light bending that happens as the light passes about the edge of some object. How much bending takes place is found by the size of wavelength of light relative to that of opening. If the opening is larger than the wavelength of light, then bending will not be noticeable.

Since, light gets diffracted due to water hence the shell kept inside the water appears to be at a different position than where it actually is

8 0
3 years ago
Why is it safe to put sodium chloride on fish and chips but not safe to use sodium and chloride?​
damaskus [11]

Answer:

You can't put sodium metal and chlorine gas on your fish and chips.

Explanation:

Sodium is an electron rich metal. Chlorine is an oxidizing gas. Put them together, and they form a salt, a compound of a metal and a non-metal. Hope it helped!!

8 0
3 years ago
Read 2 more answers
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