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3 years ago

______________ break down essential nutrients and return them to the soil.

Biology

2 answers:

dalvyx [7]3 years ago

6 0

The correct answer is A. Decomposers

Explanation:

In ecology and related, decomposers include organisms such as bacteria or fungi that differ from other organisms because they feed on dead matter or wastes. Moreover, decomposers are always located at the end of food chains or trophic networks because their role contributes to the existence of producers such as plants, considering decomposers return essential nutrients, minerals, etc. to the soil and these are used by producers. According to this, decomposers break down essential nutrients and return them to the soil.

nignag [31]3 years ago

4 0

Decomposers return nutrients to the soil

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The mitotic spindles arise from which cell structure?

Lapatulllka [165]

Answer:

The correct option is : b. centrosome

Explanation:

Centrosome is a cell organelle, which acts as the microbule organizing center and also regulates the cell cycle progression in an eukaryotic cell.

During the prophase stage of the cell cycle, the centrosomes are associated with the membrane of the nucleus. The nuclear membrane ruptures during the mitosis and the interaction of the centrosome nucleated microtubules with the chromosomes leads to the formation of the mitotic spindle.

Therefore, mitotic spindles arise from the centrosome.

5 0

3 years ago

CELL DIVISION QUESTION HELPP PLEASE!!!!!!!1

ser-zykov [4K]

Answer:

Explanation:

3 0

2 years ago

22. A plant geneticist is investigating the inheritance of genes for bitter taste (Su) and explosive rind (e) in watermelon (Cit

mylen [45]

Answer:

See the answer below

Explanation:

Using the formula for calculating Chi square ( $X^2$ ):

$X^2$ = $\frac{(O - E)^2}{E}$ where O = observed frequency and E = expected frequency.

The observed frequencies for the four phenotypes are 88, 62, 62, and 81 respectively.

For the expected frequency, the phenotypes are supposed to assort in 9:3:3:1 according to Mendel ratio.

Hence, expected frequencies are calculated as:

phenotype (1) = 9/16 x 293 = 164.81

phenotype (2) = 3/16 x 293 = 54.94

phenotype (3) = 3/16 x 293 = 54.94

phenotype (4) = 1/16 x 293 = 18.31

The $X^2$ is calculated thus:

Phenotype O E $X^2$

1 88 164.81 $\frac{(88 - 164.81)^2}{164.81}$ = 35.80

2 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

3 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

4 81 18.31 $\frac{(81 - 18.31)^2}{18.31}$ = 214.64

Total $X^2$ = 35.80 + 0.91 + 0.91 + 214.64 = 252.26

To the nearest tenth = 252

Degree of freedom = n - 1 = 4- 1 = 3

$X^2$ tabulated = 7.815

The calculated  $X^2$  exceeds the critical value, hence, the null hypothesis is rejected. The two genes did not assort independently. 

4 0

2 years ago

You hang a swing from a live tree branch that is roughly parallel to the ground. What will likely happen over time as the tree g

Bingel [31]

Complete question:

You hang a swing from a live tree branch that is roughly parallel to the ground. What will likely happen over time as the tree grows? Check All That Apply

The swing will move farther away from the tree trunk.
The swing will move up. away from the ground.
The swing will remain in its original position.
The swing's ropes will become embedded in the branch.

Answer:

The swing's ropes will become embedded in the branch.

Explanation:

The trunk or branch strangulation sadly occurs very often. When people tie a young tree with different materials, such as a rope, or a cable, or a wire, and leave it there, the leash will eventually strangulate the tree.

Strangulation occurs because the tree keeps growing, applying pressure on the leash. The vascular system is in the trunk perimeter under the crust. Through the years, the pressure increases, the trunk is even more strangulated, and the vascular system is affected. One of the first and principal effects of strangulation is the increase in the trunk or branch diameter over the leash. This diameter change is because elements of the sap can not go back to the roots and keep near the strangulation. At this point, there are two options:

The tree can sort this by including the leash in its tissues, surrounding and absorbing it, and keep growing normally

The vascular system is so affected that the tree can not sort this problem and so, those parts of the tree located over the leash dye.

In the exposed example, it seems that the tree could make it and included the swing's ropes in the branch.

6 0

2 years ago

Explain how the fossil record indicates a long history of changing life forms.

sergey [27]

<h2>Answer:</h2>

Fossil: is preserved pre historic life form present under ground at high pressure for a long time.Animal die and burried under layers of sediments.

It provides evidence about the history of life on earth. It also shows different groups of organisms, including species,that have changed over time. Because the formation of any fossil depends upon the precise combination of conditions.

As the world changes, plants and animals change with time . From fossils we compare organisms of modern time with ancient , the species we see today are very different from species that lived in the past. Thus, the fossil record can be used to show that organisms changed to meet new condition.

4 0

3 years ago

Read 2 more answers