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guapka [62]
3 years ago
7

A scientists wishes to determine whether or not a marine ecosystem underwent primary or secondary succession in the past. What e

vidence would be most useful for making this determination?
Unearth the fossil history of the ecosystem to find producers that can live on rock.
Use radiocarbon dating to determine the age of the rock underlying the ecosystem.
Determine the average age of all producer species in the ecosystem at the present time.
Determine the chemical composition of the water in the ecosystem at the present time.
Biology
1 answer:
Triss [41]3 years ago
7 0
I believe the correct answer from the choices listed above is the second option. The evidence that would be most useful for making this determination would be to u<span>se radiocarbon dating to determine the age of the rock underlying the ecosystem.</span>. Succession<span> is usually initiated by a significant disturbance of an existing community. Hope this answers the question.</span>
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Michael and Andrew are pushing a desk across the room. To be funny, Michael decides to push against Andrew instead of with him.
lions [1.4K]

Answer:

towards Andrew

Explanation:

The direction in which the desk will move would be towards Andrew.

This is a simple case of resultant force. If both Michael and Andrew had pushed the desk together across the classroom, the resultant force would have been the addition of their individual's applied forces - neglecting any other extraneous forces. However, since they decided to push against each other, the resultant force would the subtraction of their individual forces and the desk will move towards the person with who applied the lower forces out of the two.

<em>Since Michael applied force was 30 N and that of Andrew was 28 N, the resultant force would therefore be 2 N in the direction of Andrew. In other words, </em><em>the desk would move towards Andrew.</em>

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3 years ago
How does a desert,savanna and grassland help a environment!!​
JulsSmile [24]

They help an environment because they create an ecosystem allowing animals to thrive and live a lifecycle with the resources they need.

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List any 5 factors that can affect blood pressure?
Sauron [17]

<em>Smoking. </em>

<em>Being overweight or obese. </em>

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3 years ago
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Will mark brainliest!
saw5 [17]

Answer: The combination produced is RRtt.

The combination rrTt does not appear in this punnett square.

Explanation:

As the problem does not indicate more information, I assume that punnett square is made between two RRtt genotypes. It can produce gametes that have the alleles Rt. A gamete is a sexual cell (egg or sperm) that has only one allele of each gene. And, each gamete codes for a different gene. Since here we have two different types of alleles (R and t), it is a dihybrid cross.

<u>A Punnett square is a diagram used to predict the genotypes of a cross or breeding experiment.</u> It is used to determine the genotypes and phenotypes of the offspring. To do it, you have to label the rows with one parent's gametes and label the columns with the other parent's genotype. Then, have each box inherit letters from its row and column, and interpret the results.

Then, the punnett square (shown in the picture) will be between RRtt and RRtt whose gametes can only be Rt, so Rt x Rt will be made.

The result in an offspring which will be 100% RRtt, and there is no rrTt combination here because non of the parents have an r allele, then none of the children can inherit it.

To have an offspring where rrTt genotype is shown, a different genotype must be used, in which both parents must have at least one r allele and one t allele. For example, it could be Rrtt x rrTt.

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3 years ago
True or false: the breakup of pangea resulted in warm wet global climates?
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The answer is false to your question.

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