BIOLOGY HIGH SCHOOL

Limb bones within unrelated animals that have the same basic structures are consideredA. vestigial structures.
B. analogous structures.
C. homologous structures.
D. embryological.

Answers

Answer 1
Answer: They are called homologous structures.

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What does a nucleotide consist of?a polymer of nitrogenous basesnitrogenous bases and sugarsugar and phosphatesa nitrogenous base, a sugar, and a phosphate
Why do erythrocytes swell and burst when placed in water? (A) Since water concentration is higher outside the cell, water moves inward by passive diffusion. (B) Since hemoglobin concentration is higher inside the cell, hemoglobin moves outward by exocytosis. (C) Since potassium ions are more concentrated inside the cells, potassium ions move outward by osmosis. (D) Erythrocytes pump water inward by active transport to balance osmotic gradients. (E) Water is a universal solvent and simply dissolves the erythrocyte membranes.
What is not an advantage of using the pyramid of energy

Despite the energy crisis in the 1970s, the United States has what is a good answer

Answers

Despite the energy crisis in the 1970s, the United states has increased its oil dependence from foreign countries

Back then, From roughly 80 million gallons of oil's daily usage in the world, U.S consume about 20 million of them. And From that 20 million, 15 million of them was imported and dependent on middle east Countries

Answer:

Option 3. increased its dependence on foreign oil sources.

Explanation:

A neighborhood group wants to build a new playground using donations from residents. The amount needed from each donor varies inversely to the number of people donating. If 25 people donate, each of them would need to contribute $135. Solve for the amount each person needs to contribute if 45 people donate.

Answers

First of all, we need to find out how much money is needed ,

25 x $ 135 = $ 3375 

Next, we just need to divide this amount to total contributors

$ 3375 / 45 = $ 75 per person

Hope this helps
 

Answer:

Each person needs to contribute is $75.

Step by step explanation:

It is given that the number of people is 25. Each of them would need to contribute $135.

Total amount contributed by 25 people is the product of 25 and 135.

25* 135=3375

Total amount contributed by 25 people is $3375.

Now 45 people has to contribute the same amount $3375.

If 45 people donate $3375, then each people donate

(3375)/(45)=75

Therefore, each person needs to contribute is $75.

Which factor explains why coal dust is explosive?temperature
surface area
concentration
addition of catalyst

Answers

The answer to the question stated above is surface area. 
Coal dusts are fine powdered form of coal, which are formed by crushing, grinding, or pulverizing of coal. They can be created during mining, transportation, or by mechanically handling coal because of its brittle nature.
The surface area of the coal dust explains why it is explosive.

Answer:

B.

surface area

Explanation:

I got it right on Plato.

How could you identify the unmarked poles of a magnet?

Answers

Answer: A magnet has two poles that is north pole and south pole. From the directional property of the magnet, we know that whenever a magnet is freely suspended, it is always aligned along the north and south direction of the earth.

It can also be identified using a test magnet whose poles are already known. From attraction property of magnet, we know that unlike poles attract with each other and like poles repel each other. Therefore, the pole of unknown magnet that attract to the south pole of the known magnet will be north pole and the other will be south pole.

Thus, by freely suspending the magnet and by using a test magnet, the unmarked poles of the magnet could be easily identified.
You can identify the unmarked poles of a magnet using different techniques.
1) Get a marked magnet to know the north and south poles of the unmarked magnet. North of the marked magnet attracts the south of another magnet.
2) Using a compass - the north of the unmarked magnet aligns tot he north of the compass

How are amino acids put together

Answers

Amino acids are put together by peptide bonds, thus creating a long chain, if you are wondering how peptide bonds are formed it is by biochemically reactions that will extract a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.

Which process plays an important role in the biochemical cycles of carbon nitrogen and phosphorus

Answers

Answer:

C. Decomposition

Explanation:

The process that plays important role in the biogeochemical cycles of carbon, nitrogen, and phosphorus is called decomposition.

Answer:

Recycling process plays an important role in the biogeochemical cycles of carbon, nitrogen, and phosphorus.
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