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Stells [14]
3 years ago
5

People began measuring intelligence through tests roughly __________ years ago.

Biology
1 answer:
kirill115 [55]3 years ago
7 0
I believe it was around 100 years ago
Hope this helps
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BIOLOGY HELP!!!!!
Vlad [161]

1. The correct answer is pH.

The activity of the enzymes might be affected by environmental changes such as change in pH. Each enzyme has the point when it is the most active and this value is known as the optimum pH. Extremely high or low pH values can lead to loss of enzyme activity and stability.

Phosphofructokinase is sensitive to acidity, meaning that it is inhibited by low pH levels.

2. The correct answer is temperature.

Enzyme is sensitive to the environmental conditions such as temperature changes.

Temperature is a factor that usually increases the rate of enzyme-catalyzed reactions by increasing the activity of enzymes. But, after reaching the optimum temperature, reaction rate abruptly declines. This happens because enzymes are deactivated or denatured at a certain temperature (above 40° C).


8 0
3 years ago
1. How did Hubble determine that the Universe is expanding?
inna [77]

Answer:

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Explanation:

5 0
3 years ago
The examination of blood film should be performed at _____ to detect microfilariae.
amid [387]

Answer:

Night

Explanation:

Usually, a microfilariae blood test is conducted at night to coincide with the appearance of microfilariae.

8 0
2 years ago
What is the wavelength of a wave with a frequency of 0.4 kHz traveling at 16 m/s?
larisa86 [58]

Answer: 0.04metres

Explanation:

The wavelength of a wave is the distance covered by the wave after one complete cycle. It is measured in metres, and represented by the symbol λ

Recall that Velocity (V) = Frequency F x wavelength λ

V = F λ

Make λ the subject formula

λ = V / F

In this case Frequency = 0.4 kHz

Convert kilohertz to hertz by multiplying 0.4 by 1000 i.e (0.4 x 1000Hz) = 400Hz

Velocity of wave = 16 m/s

So, λ = V / F

λ = 16 m/s / 400Hz

λ = 0.04metres

Thus, the wavelength of a wave is 0.04metres

3 0
3 years ago
Read 2 more answers
Please help... getting a headache... How does natural resources onna whole impact on the earth?​
blsea [12.9K]
In short, raw material extraction and processing always impact on the environment, resulting as they do in soil degradation, water shortages, biodiversity loss, damage to ecosystem functions and global warming exacerbation. ... Products need energy and water, as well as land for shipping, marketing and use.

Sorry if I didn’t help
Anyways have a nice day / night! :)
6 0
4 years ago
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