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I am Lyosha [343]
2 years ago
10

Why do biologists measure the number of trophic levels in an ecosystem?

Biology
2 answers:
Kay [80]2 years ago
8 0
The answer is D To make it helpful for humans
ikadub [295]2 years ago
6 0

Answer:D. To Make it helpful for humans

Explanation:

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Two insecticides will be compared for their effectiveness in eliminating aphids on tomato plants. Forty tomato plants of the Big
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Answer:

The t-test

Explanation:

<em>The researcher should use a t-test to compare the two means and check if they are significantly different from each other.</em>

In using the t-test, both null (H0) and alternate (H1) hypothesis are made such that:

  • H0: n1 = n2
  • H1: n1≠ n2

Thereafter, the value of t is calculated and compared to its critical value on the table. The formula for calculating the t goes thus:

t = \frac{Y_1 - Y_2}{\sqrt{\frac{S_1}{n_1} + \frac{S_2}{n_2}  } }

where, Y1 = mean of population 1, Y2 = mean of population 2, S1 = variance of population 1, S2 = variance of population 2, n1 = number of individuals in population 1 and s2 = number of individuals in population 2.

<em>At the end of the day, if the calculated t value is more than the critical value of t, the H0 is rejected and it shows that the two means are significantly different. Otherwise, the H0 is accepted and this shows that there is not significant difference between the mean of population 1 and that of 2.</em>

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3 years ago
In chipmunks, the dominant allele (H) codes for short-haired fur and the recessive allele (h) codes for long-haired fur. What is
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50% will have long hair!

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When you cross between Hh and hh, two out of four are Hh, which is long hair, and two are hh, which is short hair.

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To test how fertilizer affects aquatic animals, a student prepared four identical containers with water fleas. The student then
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The best answer is D..

It will help u
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Compare the costs and benefits of solar power to that of nuclear power.
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carbon emissions can be absorbed by plants and trees during photosynthesis to produce food.

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Nuclear power can be a cheap way to produce electricity as deposits of uranium and plutonium will last for the next couple of thousands of years (3000-4000 years). power plants can cost colossal amounts to set up but have relatively low running costs.  please like and thank me that was a lot to write
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