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frozen [14]
3 years ago
13

If air resistance is ignored, then according to the law of conservation of energy, the sum of potential energy and kinetic energ

y of a freely falling object
Biology
1 answer:
laiz [17]3 years ago
7 0
Would be same everywhere !! mechanical energy is always constant !

and it doesn't matter air is present or not....total energy is always constant !
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How can a robin have a ddt concentration of 444 ppm even though the soil contains only 10 ppm of ddt
zaharov [31]

Robin can have a ddt concentration of 444ppm while the ddt concentration of soil is 10 ppm. This happens due to biological magnification.

<u>Explanation:</u>

In biological magnification the concentration of toxic substances at successive trophic levels keeps increasing. Due to biomagnification, what starts out as a small concentration grows  while moving to successive trophic levels. DDT is a pesticide which is used to kill pests that affect crops.

DDT used in farms gets deposited in the soil. From the soil it can reach various trophic levels. At each trophic level its concentration keeps increasing.

Robin is a bird that is a secondary consumer and thus belongs to the higher trophic level. Thus even if the DDT concentration is as low as 10ppm in the soil its concentration will keep increasing and can become a high value like 444ppm.

3 0
2 years ago
If the pig is on its back, the one doing dissection would say the pig is on the
Fudgin [204]

Answer:

Ventral

Explanation:

This is because when you want to dissect a pig, it's back is place on a dissecting tray and it's belly side is up which is the ventral side. With the ventral side, dissection will be easy and the major organs and systems can be observed easily as they will be rightly viewed because they are obvious and rightly placed at belly side up.

5 0
2 years ago
Autoimmune diseases occur when the immune system fails to recognize and tolerate ____________ antigens.
Dahasolnce [82]

Answer:

Harmful

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When you have an autoimmune disorder, your immune system does not distinguish between healthy tissue and potentially harmful antigens.

6 0
2 years ago
Which charaterrisitics are always present in all living organisms
Natali5045456 [20]
1.Movement.
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2.Respiration is a chemical reaction that happens within cells to release energy from food.
3.Sensitivity.
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5.Reproduction.
Excretion
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3 0
3 years ago
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What are the choices?
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3 years ago
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