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natta225 [31]
3 years ago
11

Scientists believe that the first prokaryotes on Earth arose ________ years ago, and the first eukaryotes arose ________ years l

ater.
Biology
1 answer:
Gwar [14]3 years ago
8 0

Answer:

3.5 billion years ago Prokaryotes arose and around 2 billion years later of Eukaryotes arose.

Explanation:

While there is some ambiguity for eukaryotes but the general consensus are on the number given

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lina2011 [118]
Example of selective breeding: Cows that produce lots of milk. Selective breeding to create more useful varieties of animals and plants is a form of biotechnology that human beings have used for thousands of years. Biotechnology includes any use of science or technology to alter the characteristics of a particular breed or animal.
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3 years ago
If you were to repeat the Meselson Stahl experiments, but rather than use N15 and N14, you use P32 and P31, how would the result
bonufazy [111]

Answer:

The correct answer will be option-C

Explanation:

The CsCl gradient centrifugation in Meselson Stahl experiments is done to separate the bands of the DNA containing isotopes on the basis of difference in the density.

In the experiment, bacterial cultures were grown in the medium of 15N and 14N but if we repeat the experiment with P32 and P31 instead of 15N and 14N and centrifugation is performed then the banding pattern will be the same as of the previous experiment as the method of the replication is same that is semi-conservative.

Thus, Option-C is the correct answer.

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3 years ago
Which traits does organism C have?
kykrilka [37]

Answer:

B i did that to and got it right!

7 0
2 years ago
A car travels 180 miles west for 3 hours. What is the average velocity?
MaRussiya [10]

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3 0
3 years ago
Conduct online research to learn more about competition between two species not mentioned in this lesson. Make sure to include i
Levart [38]

Answer:

(Answers will vary.)

In many forest ecosystems, squirrels and chipmunks compete for acorns and some other resources. However, they don’t have the exact same niches. Squirrels nest in trees, while chipmunks live underground. These species don’t compete with each other for mates either. Thus, squirrels are in interspecific competition with chipmunks.

All squirrels in a particular ecosystem share the same niche. The same is true of all chipmunks. So, both of these species are in intraspecific competition. Competing with an individual from the same species is harder than competing with members of other species. For example, squirrels compete with other squirrels for not only food (acorns), but also shelter and mates. However, they also compete with some other species, such as deer and acorn weevils, for acorns. Furthermore, they are both prey for many of the same predators, such as hawks, raccoons, foxes, and weasels.

Explanation:

8 0
3 years ago
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