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AlladinOne [14]
3 years ago
13

What is the current greatest threat to agricultural sustainability?

Biology
2 answers:
AnnZ [28]3 years ago
8 0
I'd say water pollution B
Korolek [52]3 years ago
8 0
A this is because current is the spontaneous movement of water therefore with that force on agricultural soil will wear away the soil
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Rhonda Runsalot is a 20 year old woman. She is running at VO2max. Her heart rate is 200 b/min. Her stroke volume is 100 ml blood
katen-ka-za [31]

Answer:

Cardiac output = 20 L/min

Explanation:

The cardiac output of a person refers to the volume of blood the heart pumps in a minute. The normal range for cardiac output is about 4 to 8 L/min. However, this can vary depending on the metabolic needs of the individual at any instant of time, for example, it is higher when exercising than  when resting.

Cardiac output is calculated from the product of the stroke volume in liters/min and the heart rate in beats/min

Cardiac output  = stroke volume * heart rate

For the individual who is running; stroke volume = 100 mL/beat or 0.1 L/beat

heart rate = 200 beats/min

Cardiac output =0.1 L/beat * 200 beats/min

Cardiac output = 20 L/min

6 0
2 years ago
Some materials can move across the cell membrane against a concentration gradient by
Anastasy [175]

Answer:

Molecules which move against the concentration gradient across the cell membrane employ the mechanism of active transportation.

Explanation:

Normally, permitted molecules moves across the cell membrane of the cell by the process of diffusion and osmosis. This is used when molecules move from hypertonic region to hypotonic region (if ions) and hypotonic to hypertonic (if water). This is a passive transportation which do not require the expense of energy from the cell.

In contrast, when molecules move in or out of the cell against their concentration gradient, that is ions moving from hypotonic region to hypertonic region, they implore the expense of energy in form of adenosine triphosphate (ATP), and the involvement of the membrane carrier proteins. This is called active transport.

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3 years ago
What quantity is equal between two solutions that are isotonic ?
bazaltina [42]

An isotonic solution is a solution in which the amount of dissolved material is equal both inside and outside of the cell. Water still flows in both directions, but an equal amount enters and leaves the cell.  Hope this helps. :)

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How do humans obtain the nitrogen they use in their bodies
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Fantom [35]

Answer:

i dont understand the question

Explanation:

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3 years ago
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