How did humans create cow breeds that survive well in cold weather?

1 answer:

8 0

Answer: They identified cows that did well in cold weather and mated them. This is known as selective breeding. All the other answers either cannot work as cross-species breeds generally don't work, or they target cows that survive well in hot weather.

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3. Which word best fits with the Earth's day and night cycle

pogonyaev

It is known as rotation. It spins on its access while doing so

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4 years ago

If on substance has 9 positive charges and 11 negative charges is it positive or negative

Bingel [31]

Answer:

Negative.

Explanation:

The nine positive charges can cancel with nine of the negative charges leaving only two negative charges, which makes it negative.

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3 years ago

Is the ability to evaporate a physical or chemical property?

emmasim [6.3K]

The ability to evaporate is a PHYSICAL PROPERTY

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4 years ago

2Na + 2H2O → 2NaOH + H2 During a laboratory experiment, a certain quantity of sodium metal reacted with water to produce sodium

anyanavicka [17]

Answer : The initial quantity of sodium metal used is 17.25 grams.

Solution : Given,

Volume of $H_2$ gas = 8.40 L

Molar mass of Na metal = 23 g/mole

The Net balanced chemical reaction is,

$2Na+2H_2O\rightarrow 2NaOH+H_2$

At STP, 22.4 L of volume is occupied by 1 mole of $H_2$ gas

so, 8.40 L of volume is occupied by = $\frac{8.40L\times 1mole}{22.4L}$ = 0.375 moles of $H_2$ gas

Now from the above reaction, we conclude that

1 mole of $H_2$ gas produced by the 2 moles of Na metal

0.375 moles of $H_2$ gas produced = $\frac{2moles\times 0.375mole}{1mole}=0.75moles$ of Na metal

The quantity of Na metal used = Moles of Na metal × Molar mass of Na metal = 0.75 moles × 23 g/mole = 17.25 grams

Therefore, the initial quantity of sodium metal used is 17.25 grams.

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3 years ago

What was the normal perception of a scientist up until the seventeenth century

igomit [66]

Working in a factory to develop new technology

wearing a white lab coat working in a laboratory

working in the woods to study nature

collaborating with groups of peers to discuss ideas

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3 years ago